Answer :

It is given that y =

Now, we can change the numerator and the denominator,
We know that we can write,

Therefore, by applying the formula: (a + b)2 = a2 + b2 + 2ab and (a - b)2 = a2 + b2 - 2ab, we get,

Dividing the numerator and denominator by cos (y/2), we get,

Now, we know that:

Now, differentiating both sides, we get,

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