求解几个高等数学问题,关于定积分和不定积分的。求高人指点,要详细步骤。
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1; 令:tanx/2=t
2:
∫[-π,π] xsin^7 dx = 2*∫[0,π] xsin^7 dx
= 2∫[0,π] (π-t)sin^7t dt 令:t=π-x
=π/2∫[0,π] sin^7t dt
=π∫[0,π/2] sin^7t dt
3:
I= ∫(2/3*[3xdx]- dx)/2√([3x/2]^2-1)
4:
I=∫([2x+2]dx/2 -dx)/ √[(x+1)^2 +1]
5:
I=∫d(2(x-1/2)/√3)√(1-[2/√3(x-1/2)]^2)
6:
I= ∫[1dx - 2*[e^(-x)dx]/(1+e^(-x))
2:
∫[-π,π] xsin^7 dx = 2*∫[0,π] xsin^7 dx
= 2∫[0,π] (π-t)sin^7t dt 令:t=π-x
=π/2∫[0,π] sin^7t dt
=π∫[0,π/2] sin^7t dt
3:
I= ∫(2/3*[3xdx]- dx)/2√([3x/2]^2-1)
4:
I=∫([2x+2]dx/2 -dx)/ √[(x+1)^2 +1]
5:
I=∫d(2(x-1/2)/√3)√(1-[2/√3(x-1/2)]^2)
6:
I= ∫[1dx - 2*[e^(-x)dx]/(1+e^(-x))
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