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Why is [sin(2x)] / sin(x) = 2cos(x)?

Why is [sin(2x)] / sin(x) = 2cos(x)?
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Why is [sin(2x)] / sin(x) = 2cos(x)?

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User Washcloth
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Why is [sin(2x)] / sin(x) = 2cos(x)?-example-1
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User Biffen
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