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Question #0e649

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Jan 21, 2018

#sin2A+cos2A#

#=1+sin2A-1+cos2A#

#=sin^2A+cos^2A+2sinAcosA-1+cos^2A-sin^2A#

#=(sinA+cosA)^2-1+(cosA+sinA)(cosA-sinA)#

#=(1)^2-1+1*(cosA-sinA)#

#=cosA-sinA#

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