prove that : (1+cosA)^2 - (1-cosA)^2 = 4cosA
plz answer fast
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Step-by-step explanation:
=(1+cosA)^2-(1-cosA)^2
=1+cos^2A+2cosA-1-cos^2A+2cosA
=2cosA+2cosA
= 4cosA
hope it helps you
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