What is the minimum provision percentage on Doubtful

If cosec (2A + B) = 2 and cosec (A + B) = 1, find the value of (3A – B).

sin² 12˚ + sin² 14˚ + sin² 16˚ + sin² 18˚ + ……… + sin² 78˚ =?

If cot5A = tan(3A-14˚), find the value of A? Given that 5A and 3A-14˚ are acute angles.

If x = 4 cos A + 5 sin A snd y = 4 sin A – 5 cos A, then the value of x²+y² is :

Solve the following trigonometric expression:

If sec 4A = cosec (3A - 50°), where 4A and 3A are acute angles, find the value of A + 75.

Find the maximum value of 18 sin A + 7 cos A.

If sin(3x - 2^o) = cos(2x + 22^o), then find the value of: {3tan(4x - 11^o) + cosec(5x - 10^o)} X cot(2x + 2

Simplify the following trigonometric expression:
10 cos 71° sec 19° − 4 cot 62° tan 28°

Simplify: sin (A + B) sin (A - B)