Q25 of 43 Page 5

If sin y = x cos (a + y), then show that

Also, show that , when x = 0.  (CBSE 2018)

Given:


• sin y = x cos (a + y)



On differentiating with respect to y we get



cos(a–b) = cos a cos b + sin a sin b




From sin y = x cos (a + y) when x = 0, y = o



Hence, at x = 0,

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