how 2 come there pls tell tommarow exam
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when u expand (a+b)whole square, the identity is a square + b square + 2 (ab) .
So, when (sinA + cosA)2 is expanded, answer wil come as sin2A + cos2A+ 2cosAsinA
I hope you understand.
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dude it's the formula of (sinA+cosA)-1 you can also see in the examples of book
and it also expended in (a+b)^
(sin^A+cos^A)+2cosAsinA
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