Q. 574.2( 6 Votes )

If cos y = x cos (a + y), where prove that

Answer :

Here,


cos y = x cos (a + y), where cos a


Differentiating both sides with respect to x, we get





Multiplying the numerator and the denominator by cos(a+y) on th RHS we have,



[Given cos y = x cos (a + y)]


[ sin(a-b)=sina cosb - cosa sinb]



Hence Proved.


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