This question is from trigonometry topic – trigonometric identities in which we have been asked to prove that (cosecθ + cotθ)/(cosecθ – cotθ) = (cosecθ + cotθ)² = 1 + 2cot²θ + 2cosecθcotθ
RS Aggarwal, Class 10, chapter 13A, question no 26(i)
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