$4.296 \times 10^{-8} \mathrm{~cm}$

$7.301 \times 10^{-8} \mathrm{~cm}$

$3.715 \times 10^{-8} \mathrm{~cm}$

$5.419 \times 10^{-8} \mathrm{~cm}$

$\cos x=\mathrm{c} \operatorname{cosec} y$, where c is the constant of integration.

$\sin x=\mathrm{c} \sec y$, where c is the constant of integration.

$\sin x=x \cos y$, where c is the constant of integration.

$\cos x=\mathrm{c} \sin y$, where c is the constant of integration.

$\frac{1}{2}$

$\frac{1}{\sqrt{2}}$

$\frac{1}{4}$

$\frac{1}{2 \sqrt{2}}$