Find a primitive function for $7\sin x$7sinx.
You may use $C$C as a constant.
Find a primitive function for $-7\cos x$−7cosx.
You may use $C$C as the constant of integration.
Find the integral of $\sin7x$sin7x.
You may use $C$C as the constant of integration.
Integrate $\cos6x$cos6x.
You may use $C$C as the constant of integration.