Q8 of 113 Page 584

Prove that


To Prove: = tan( )


Proof: Consider, L.H.S =


Multiply and divide L.H.S by


= =


= ()


= ()


=


= ()


=


Multiply and divide the above with cos


=


Here, since tan = 1


= tan() = R.H.S


Since, L.H.S = R.H.S, Hence proved.


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