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}= a

^{2}+ b

^{2}+ 2ab and (a - b)

^{2}= a

^{2}+ b

^{2}- 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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