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यदि x cos (a+y) = cos y, तो दर्शाइए कि (...

यदि `x cos (a+y) = cos y`, तो दर्शाइए कि `(dy)/(dx) = (cos^(2) (a+y))/(sin a)`. अत: सिध्द कीजिए कि `sin a (d^(2)y)/(dx^(2)) + sin 2 (a+y) (dy)/(dx) = 0`

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