Mathematics, 18.11.2019 09:31 cordobamariana07

Trigonometry - verify identity:

cos (x - y) / sin (x + y) = 1 + cotxcoty / cotx + coty

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Trigonometry - verify identity:

cos (x - y) / sin (x + y) = 1 + cotxcoty / cotx + coty...

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