Prove that (cosecθ- cosθ)^2= (1-cosθ)/(1+cosθ), NCERT SOLUTIONS

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Prove that (cosecθ- cosθ)2= (1-cosθ)/(1+cosθ),
(cosecA- cosA)^2= (1-cosA)/(1+cosA),
NCERT SOLUTIONS, CLASS 10 MATHS, TRIGONOMETRY, TRIGO, TRIKONMITI, BY SURINDER SIR, THE MATHS GURUDEV
INTRODUCTION OF TRIGONOMETRY CLASS X th MATHEMATICS
EXERCISE 8.4, CLASS 10

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