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Mathematics, 21.05.2021 06:10 allimaycatp8qgaq

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$\sqrt{\frac{1-sin\theta }{1+sin\theta} } =sec\theta -tan\theta$
$\sqrt{\frac{1+cos \theta}{1-cos\theta} } +\sqrt{\frac{1-cos\theta}{1+cos \theta} } =2cos \:ec\theta$

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