Question: If y = x/a2 - 1 - 2/a2 - 1 arctan sin x/ a + a2 - 1 + cos x show that y' =

If
y = x/√a2 - 1 - 2/√a2 - 1 arctan sin x/ a + √a2 - 1 + cos x
show that y' = 1/a + cos x.

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