Q. 254.3( 35 Votes )

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Answer :

LHS
Multiply and divide by (sin A + cos A + 1) to get,


As we know,
(a-b)(a+b) = a2 - b2


As we know,
(a+b)2 = a2 + b2 + 2ab

           
As we know,
1 - cos2A = sin2A

 

 

 

 


RHS

       

       

       

       

       

LHS = RHS


Hence proved.

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