Indefinite Integration

$-\frac{\cos ^4 x}{(1+\sin x)^3}+c$

$-\frac{\cos ^3 x}{(1+\sin x)^3}+c$

$-\frac{\cos ^4 x}{(1+\sin x)^4}+c$

$-\frac{\cos ^4 x}{4(1+\sin x)^4}+c$