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Mathematics, 07.03.2021 01:00 champions2k19

Find sin 2x, cos 2x, tan 2x given that cos x=−( ​5/13 ), π /2​ < x< π

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Find sin 2x, cos 2x, tan 2x given that cos x=−( ​5/13 ), π /2​ < x< π...
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