Q11 of 104 Page 204

Prove the following by using trigonometric identities:

L.H.S






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9

Prove the following by using trigonometric identities:

2sec2θ — sec4θ — 2cosec2θ + cosec4θ = cot4θ — tan4θ.

 10

Prove the following by using trigonometric identities:

(sinθ — secθ)2 + (cosθ — cosecθ)2 = (1 — secθ ⋅ cosecθ)2.

 12

Prove the following by using trigonometric identities:

 13

Prove the following by using trigonometric identities: