Advertisements
Advertisements
Question
Prove that:
cos 30° . cos 60° - sin 30° . sin 60° = 0
Sum
Advertisements
Solution
LHS=cos 30°. cos 60° - sin 30°. sin 60°
= `(sqrt3)/(2) (1)/(2) – (1)/(2) (sqrt3)/(2) = (sqrt3)/(4) – (sqrt3)/(4) = 0 = RHS`
shaalaa.com
Is there an error in this question or solution?
