Mathematics
Mathematics, 12.07.2019 21:00, gymnast5464

If a, b and c are interior angles of δ abc, show that sec² (b+c / 2) -1 = cot²a/2 trigonometry class 10 maths. pls me asap.

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If a, b and c are interior angles of δ abc, show that sec² (b+c / 2) -1 = cot²a/2 trigonometry class...

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