Show that sin 4 cos 4 = 3/128 1/32 cos(4) + 128 cos(8).
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Show that sin4θ cos4θ = 3/128 − 1/32 cos(4θ) + 128 cos(8θ).
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Precalculus Concepts Through Functions A Unit Circle Approach To Trigonometry
ISBN: 9780137945139
5th Edition
Authors: Michael Sullivan
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