1.

Express each of the following as the product of sines and cosines:(i) sin 12x + sin 4x(ii) sin 5x − sin x(iii) cos 12x + cos 8x(iv) cos 12x − cos 4x(v) sin 2x + cos 4x

Answer» Express each of the following as the product of sines and cosines:

(i) sin 12x + sin 4x

(ii) sin 5x − sin x

(iii) cos 12x + cos 8x

(iv) cos 12x − cos 4x

(v) sin 2x + cos 4x


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