求不定积分 $\displaystyle\int\sin^4 x\mathrm{d}x$, $\displaystyle\int\cos^4 x\mathrm{d}x$.
求不定积分 $\displaystyle\int\sin^4 x\mathrm{d}x$, $\displaystyle\int\cos^4 x\mathrm{d}x$.
求不定积分 $\displaystyle\int\sin^6 x\mathrm{d}x$, $\displaystyle\int\cos^6 x\mathrm{d}x$.