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Question #cb85c

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Mar 3, 2017

#Sec2x#

#=1/(cos2x)#

#=1/(2cos^2x-1)#

#=(1/cos^2x)/((2cos^2x-1)/cos^2x)#

#=(1/cos^2x)/(((2cos^2x)/cos^2x-1/cos^2x)#

#=sec^2x/(2-sec^2x)=RHS#

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