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For #5-7, consider the angle 0 whose terminal side intersects the point (-4,5). . Use a double-angle formula to find the exact value of cos

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For #5-7, consider the angle 0 whose terminal side intersects the point (-4,5). . Use a double-angle formula to find the exact value of cos 20. COS 6. Use a power-reducing formula to find the exact value of sin 0. 7. Use a half-angle formula to find the exact value of tan

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