Question: 11. Two trigonometric identities are given by: (a) (sin x + cos x)=1+2 sin xos x (b) 1-2 cos x-3 cos x x-3cos 1-3cos x

11. Two trigonometric identities are given by:

(a) (sin x + cos x)=1+2 sin xos x

(b) 1-2 cos x-3 cos x x-3cos 1-3cos x sin x 1-cos x For each part, verify that the identity is correct by calculating the values of the left and right sides of the equation, substituting x=20.

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