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Question #ed0a0

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Aug 7, 2017

$cosx+tanx*sinx$

$=cosx+sinx/cosx*sinx$

$=cosx+sin^2x/cosx$

$=cosx+(1-cos^2x)/cosx$

$=cosx+1/cosx-cos^2x/cosx$

$=cosx+secx-cosx$

$=secx$

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