Find , when:
Formulae :
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Given,
Put x = tan a
Therefore, …………… eq (1)
y = sin (cos 2a) ………….
Differentiating above equation w.r.t. a ,
………….
………….
………….
But, x = tan a
…………………….. eq (2)
Now,
………… By chain rule
…………….. from eq (1) & eq (2)
…..…….
…..…….