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Question #ba55e

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Dec 18, 2016

#LHS=(sin2x)/(secx+1)*(sec2x)/(sec2x+1)#

#=(sin2x)/(secx+1)*(sec2x*cos2x)/(cos2x(sec2x+1))#

#=(2sinxcosx)/(secx+1)*1/(1+cos2x)#

#=(2sinxcosx)/(secx+1)*1/(2cos^2x)#

#=tanx/(secx+1)!=RHS#

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