Q. 64.1( 156 Votes )

Prove <img alt="c

Answer :

To Prove:

 

Formula used : cos A cos B - sin A sin B = cos(A + B)


Proof :

Since, [cos A cos B – sin A sin B = cos (A + B)]


 


Here




                      

[ By complementary angle formula cos(90° - A) = sin A]


∴ LHS = RHS


Hence, proved.

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