Use sum and difference formulas to prove that each statement is true 11 sin x 2 sin x 13 cos x 2 sin x 12 cos x 2 cos x 14 sin x

Question

Use sum and difference formulas to prove that each statement is true 11 sin x 2 sin x 13 cos x 2 sin x 12 cos x 2 cos x 14 sin x 2 cos x 15 cos 180 cos 0 16 sin 180 sin 17 sin 90 6 cos 0 18 cos 90 0 sin 0

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