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

If cos 2A = 15, then find cos A

Given that tan(A+B) = √3 and tan(A-B) =1/√3, find the values of A and B.

sin² 7 ° + sin² 8 ° + sin² 9 ° + sin² 10 ° + ……… + sin² 83 ° = ?

(tan 5x - tan 3x - tan 2x) = ?

Find the value of the given expression.

2 × (cos 60° – tan 45° + sec 60°)

Simplify the following trigonometric expression:

If √3 tan 2θ – 3 = 0, then find the value of tanθ secθ – cosθ where 0 < θ < 90°