Prove :
(1 - cos2θ) csc2θ = 1
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Solution :
Let A = (1 - cos2θ) csc2θ and B = 1.
A = (1 - cos2θ) csc2θ
Because sin2θ + cos2θ = 1, we have
sin2θ = 1 - cos2θ
Then,
A = sin2θ ⋅ csc2θ
A = sin2θ ⋅ (1/sin2θ)
A = sin2θ /sin2θ
A = 1
A = B (Proved)
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