【高校 数学Ⅱ】 式と証明20 等式の証明3 (12分)
Watch all the lessons from Try's talented instructors for free! Try IT video lessons for junior high and high school students are designed to be easy to understand! You can use them to prepare and review for school, as well as for regular tests and exam preparation. The lessons are taught by top instructors with plenty of teaching experience, who are known for their fun and easy-to-understand teaching methods. *This lesson is a video created during the old curriculum. *Please be careful when watching it to prepare for entrance exams or regular tests for the new curriculum. If you watch the video and think, "It's easy to understand!" or "I want to take a class like this!", Try's individual instruction may be right for you. For details on Try's individual instruction service, to request materials, or to contact us, please click here. https://bit.ly/4hjhKSE In addition, +‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥+ Try offers free video lessons, "Try IT," to support home learning. "Try IT" can be used free of charge even by non-members. Please use it to prepare for exams and improve your home study. Video Lessons Try IT Official Website here: https://bit.ly/4jLULBg +‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥+ In this video lesson, you can learn "High School Mathematics II: Equations and Proofs 20, Equation Proof 3" in about 12 minutes. The key to solving the problem is "(Left side) → Calculation, (Right side) → Dig a tunnel using calculations." Please watch the video lesson in the following order: [Points] ⇒ [Examples] ⇒ [Practice] ⇒ [Summary]. If you have any questions about a unit other than this one, please click on the URL below. You can watch the video lessons for each unit together. ■If you have any questions about "Mathematics II", click here! ・Mathematics II Expansion, factorization and binomial theorem https://goo.gl/TkUpx6 ・Mathematics II Calculation and value finding of fractional expressions https://goo.gl/1WQ3Cn ・Mathematics II Division of polynomials and remainder theorem https://goo.gl/hNyyv3 ・Mathematics II Equation and identity proof problems https://goo.gl/lE00Lh ・Mathematics II Complex numbers https://goo.gl/u5Q9Bc ・Mathematics II Solution of quadratic equations of discrimination, relationship between solution and coefficient https://goo.gl/XLqXE8 ・Mathematics II: Higher-order equations https://goo.gl/CjeKXz ・Mathematics II: Points on a line, points on a plane https://goo.gl/PHjKlW ・Mathematics II: Lines, two parallel and perpendicular lines https://goo.gl/NNp5b2 ・Mathematics II: Circles and lines, relationship between two circles https://goo.gl/mD09m1 ・Mathematics II: Trajectories and areas https: //goo.gl/wZgkYf ・Mathematics II: Trigonometric ratios and trigonometric functions https://goo.gl/HTDn4p ・Mathematics II: Relationship between sinθ and cosθ https://goo.gl/DkpzIc ・Mathematics II: Equations of sinθ, cosθ, and tanθ and general angles https://goo.gl/3Z3Cjo ・Mathematics II: Graphs of trigonometric functions and addition theorems https://goo.gl/wdiA3h ・Mathematics II: Composition of trigonometric functions https: //goo.gl/rKgKNS ・Mathematics II: Exponential Functions https://goo.gl/b5csBE ・Mathematics II: Logarithmic Functions https://goo.gl/VUeIAO ・Mathematics II: Limits and Differential Functions https://goo.gl/iShz4L ・Mathematics II: Differential Calculus https://goo.gl/iqGbx0 ・Mathematics II: Integration Methods https://goo.gl/HhWVSg ■If you have any questions about "Mathematics B", click here! ・Mathematics B Arithmetic progression (general terms and sum) https://goo.gl/gtXAGw ・Mathematics B Geometric progression (general terms and sum) https://goo.gl/lS60F8 ・Mathematics B Application of arithmetic and geometric progressions https://goo.gl/YQm99S ・Mathematics B Sequence and Σ calculations https://goo.gl/LxRn4p ・Mathematics B Difference sequence https://goo.gl/k13tYA ・Mathematics B Sum of special sequences https://g oo.gl/DQfdcd ・Mathematics B Recurrence formulas and mathematical induction https://goo.gl/Uvs8rv ・Mathematics B Vector definition and components https://goo.gl/3OHnXF ・Mathematics B Vector inner product and perpendicular conditions https://goo.gl/wR64EL ・Mathematics B Equinox formula and vector equation of a line https://goo.gl/wa4GJ8 ・Mathematics B Space vectors https://goo.gl/7oLJos
![[High School Mathematics II] Equations and Proofs 21 Proof of Inequalities 1 (16 minutes)](https://i.ytimg.com/vi/NmrjjCT-KXw/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLCxsNdN_NkAc3zq_0_EY7lfj5eH1w)
[High School Mathematics II] Equations and Proofs 21 Proof of Inequalities 1 (16 minutes)
![[High School Physics] Waves 26: Interference of wave sources in phase (20 minutes)](https://i.ytimg.com/vi/A5qZNdnIyS4/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLBiARa-pBYE3FQlphe9Z27XilSoLw)
[High School Physics] Waves 26: Interference of wave sources in phase (20 minutes)

Deutschland – Paraguay Highlights | Sechzehntelfinale, FIFA WM 2026 | sportstudio
![[High School Mathematics II] Equations and Proofs 16 What is an Identity? (13 minutes)](https://i.ytimg.com/vi/YAL4AC4bzLs/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLB6i4sLcK-W_8gcZav0syF_U75MZg)
[High School Mathematics II] Equations and Proofs 16 What is an Identity? (13 minutes)

What Is a Variable in Algebra? | Algebra for Beginners
![[High School Mathematics II] Formulas and Proofs 24: Additive and Geometric Means (17 minutes)](https://i.ytimg.com/vi/sffGRpMnDQM/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLAEU_4Q_usV2vESkx4WdaaTWz-vhg)
[High School Mathematics II] Formulas and Proofs 24: Additive and Geometric Means (17 minutes)

2026レベルアップ数学Ⅲ極限の重要問題①「二項定理を使う証明問題」
![[Mathematics II Trigonometric Functions] Sum↔Product Formula ~All of them were multiple choice~ [...](https://i.ytimg.com/vi/QsZWE9Ioi40/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLBp-85kwOK-smCu0nmJdriqF3vLxA)
[Mathematics II Trigonometric Functions] Sum↔Product Formula ~All of them were multiple choice~ [...

AfD überrascht den Bundestag – Merz hat darauf keine Antwort! 💥
![[High School Mathematics II] Equations and Proofs 19 Equation Proof 2 (16 minutes)](https://i.ytimg.com/vi/MMtpQJ7WaVU/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLBj4mS3cWaq6KYqR-Xc8d59sjhWAw)
[High School Mathematics II] Equations and Proofs 19 Equation Proof 2 (16 minutes)

Frankreich – Schweden Highlights | Sechzehntelfinale, FIFA WM 2026 | sportstudio

Video: Learn to “Always” Solve Asymptotic Expressions from Zero (for beginners)

【高校数学】 数Ⅱ-20 不等式の証明②

【数学Ⅰ】2次不等式(解なし、全ての実数など)

Die LUSTIGSTEN Schülerantworten in TESTS #8
![[High School Mathematics II] Formulas and Proofs 15 Factor Theorem (20 minutes)](https://i.ytimg.com/vi/zaP-cCSXtc0/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLBkc0K0rU6Lfrix9E-1Rr35ev8cLQ)
[High School Mathematics II] Formulas and Proofs 15 Factor Theorem (20 minutes)

This Orbit is the WORST
![[High School Mathematics II] Equations and Proofs 22 Proof of Inequalities 2 (14 minutes)](https://i.ytimg.com/vi/O2FhiuTMgOc/hqdefault.jpg?sqp=-oaymwEjCNACELwBSFryq4qpAxUIARUAAAAAGAElAADIQj0AgKJDeAE=&rs=AOn4CLCnUaBkZyqCaKZHlU44biDMFurfPw)
[High School Mathematics II] Equations and Proofs 22 Proof of Inequalities 2 (14 minutes)

