Intro to Trigonometric Identities - part 1

In this video I go through a brief introduction to trig identities. I look at well known identities such as sin^x + cos^x = 1, then go through some example problems. Part 2:    • Secant, Cosecant and Cotangent - (2 of 4: ...   practice problems: http://bit.ly/2ITWDYL Support the channel:    / @mathonify