Related Questions
If 4 cos2 A - 3 = 0 and 0° ≤ A ≤ 90°; then prove that :
(i) sin 3A = 3 sin A - 4 sin3 A
(ii) cos 3A = 4 cos3 A - 3 cos A
Find A, if 0° ≤ A ≤ 90° and :
(i) 2 cos2 A - 1 = 0
(ii) sin 3A - 1 = 0
(iii) 4 sin2 A - 3 = 0
(iv) cos2 A - cos A = 0
(v) 2 cos2 A + cos A - 1 = 0
Prove that :
(cosec A - sin A)(sec A - cos A) sec2 A = tan A
Prove the identity (sin θ + cos θ)(tan θ + cot θ) = sec θ + cosec θ.