580 557 528 497 ?

If tanθ = x then find the value of cos 2θ?

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

sin² 7˚ + sin² 9˚ + sin² 11˚ + sin² 12˚ + ……… + sin² 83˚ = ?

What is the value of [(sin x + sin y) (sin x – sin y)]/[(cosx + cosy) (cosy – cosx)]?

The value of (3tan10°-tan³10°)/(1-3tan²10°) is equal to

If 2x = cosec @ and 4/x = cot @ then the value of 2(x ² - 1/x ² ) is

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

tan 1˚ × tan 2˚× …………………….tan 88˚ × tan 89˚ = ?

If (sinθ+cosθ)/(sinθ-cosθ) = 2, then the value of sin⁴ θ is