Simplifying trigonometric expressions| Reduction formula| Co-functions| Grade 12 Maths exam

#reductionformula #trigonometry #firstquadrant #secondquadrant #thirdquadrant #fourthquadrant #castdiagram The derivation of the reduction formulae was discussed in the previous video with a link    • Reduction formulae fully explained with th...  . Such formulae are sin(180-A)=sinA cos(180-A)=-cosA tan(180-A)=-tanA cos(360-A)=cosA sin(360-A)=-sinA tan(360-A)=-tanA Negative angles were also discussed and these were cos(-A)=cosA sin(-A)=-sinA tan(-A)=-tanA sin(A-180)=-sinA cos(A-180)= -cosA The above-mentioned reduction formulae will be used to simplify the trigonometric expression in question.