যদি, $\sin y=x \sin (a+y)$ হয় তবে, $\frac{d y}{d x}$ এর মান কোনটি?

$\frac{\sin ^{2}(a+y)}{\tan a}$

$\frac{\sin ^{2}(a+y)}{\sin a}$

$\frac{\sin ^{2}(a+y)}{\cos a}$

$\frac{\sin ^{2}(a+y)}{\sec a}$

$\frac{\sin ^{2}(a+y)}{\cos y}$