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Question #988f9

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Mar 2, 2017

#LHS=(sin (theta)+cos(theta))^2 + (sin(theta)-cos(theta))^2#

#=(sin^2(theta)+cos^2(theta)+2sinthetacostheta + sin^2(theta)+cos^2(theta)-2sinthetacostheta)#

#=2(sin^2(theta)+cos^2(theta))=2*1=2=RHS#

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