If A = 30°, then cos4 A - sin4 A is equal to :
sin 60°
tan 60°
cot 60°
cos 60°
7 Likes
Answered By
3 Likes
If A = 30° ; 3 sin A - 4 sin3 A is equal to:
cos 3A
tan 3A
sin 3A
cot 3A
If A = 45° ; then 2 sin A cos A is equal to :
1
0
-1
2
Given A = 60° and B = 30°, prove that :
sin (A + B) = sin A cos B + cos A sin B