The gas usually causing explosions in coal mines is-

Find the value of sin(θ) if 2sinθ = tanθ, for 0 < θ < 90°.

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

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

Find the value of the given trigonometric expression:

(sin 40°cos 50° + cos²40°) × sin 30° + (cos 60°tan 45°) × sec 60°

Find the maximum value of 14 sin A + 24 cos A.

Simplify (cos20°+sin 20°) /(cos20°-sin20°)

If x tan 60° + cos 45° = sec 45° then the value of x² + 1 is

If tan 4θ = cot 14θ, then find the value of cos 9θ.