Q. 234.0( 7 Votes )

Find , when:

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

Answer :

Let us differentiate the whole equation w.r.t x


Formula :


According to chain rule of differentiation



According to product rule of differentiation



Therefore ,








( Multiply and divide by cos (y+a) )


(Since cos y = x cos (y + a))


(Formula sin(a-b)=sin a cos b – cos a sin b)



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