If
show that
is independent of x.

Multiplying numerator and denominator




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Using sin2θ + cos2θ = 1
![]()
Using 2sinθ cosθ = sin2θ and 2cos2θ – 1 = cos2θ

Now
![]()
![]()
Differentiating w.r.t x, we get
![]()
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