Multiplying and dividing with (cosecθ - cotθ),
⇒ = ×
We know that (a + b) (a – b) = a2 – b2.
We know that cosec2θ - cot2θ = 1.
We know that = cosecθ and = cotθ.
⇒ = sinθ () - sinθ ()
= 1 – cosθ = RHS
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