求定积分:[(x的2次方)乘以sinx]dx,上限是2分之pai,下限是0?$(acontent)
问题描述:
求定积分:[(x的2次方)乘以sinx]dx,上限是2分之pai,下限是0?
$(acontent)
答
[(x的2次方)乘以sinx]dx,上限是2分之pai,下限是0
=(-x²cosx+2xsinx+2cosx)|(0,π/2)
=π-(2cos0)
=π-2