06/23/19
Use a product-to-sum identity to rewrite the expression.
sin 5t cos 2ta. 0.5(sin 7t - sin 3t)b. 0.5(cos 7t - cos 3t)c. 0.5(sin 7t + sin 3t)d. 0.5(cos 7t + sin 7t)
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06/23/19
Express cos 4 x in terms of cos x.
a. cos3x - 3 sin2 x cos xb. 2 sin x cos3x - 4 sin3x cos xc. cos4x - 6 sin2x cos2x + sin4xd. 3 sin x - 4 sin3x
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