Is tan(x + 90) = -cot(x) ?

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- Nov 12th 2013, 08:04 AM #1

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- Nov 12th 2013, 08:46 AM #2

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- Nov 12th 2013, 08:47 AM #3

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- Nov 12th 2013, 11:14 AM #4

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- Nov 12th 2013, 11:32 AM #5

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