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Question #480a9

1 Answer

Jul 6, 2016

#-sin^2x#

Explanation:

Since

#1-sin^2x=cos^2x#

and #secx=1/cosx#

you have

#(1-sin^2x)(1-sec^2x)=#

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

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

#-sin^2x#

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