Math, asked by deekshitha13, 1 year ago

prove that : (1+cosA)^2 - (1-cosA)^2 = 4cosA
plz answer fast

Answers

Answered by aarabnayak

0

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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