class 11 maths chapter 3 ex .3.3 question 10
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questions. sin (n+1)x sin(n+2)+ cos (n+1)×cos (n+2)x =cos x
solution . formula = cos(x-y) = cos x. cosy+ sinx.siny
by using formula
cos[(n+1)x-(n+2)x]
cos (nx+ 1x -nx -2x )
cos (-1x)
cos x
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