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6. Find the exact value of sin 20 given that tan a = -2, a E IV. 7. Find tan(, arccos ? ) by half-angle
6. Find the exact value of sin 20 given that tan a = -2, a E IV. 7. Find tan(, arccos ? ) by half-angle formula. 8. For the trigonometric expression 2 cos2 3x + sin 4x, rewrite it in sum form by power-reducing formula
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