这题怎么求积分的谢谢了。 20
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令 x = sinu,则·
I = ∫<0, π/2> cosu(sinu)^2cosudu = ∫<0, π/2> (sinucosu)^2du
= (1/4) ∫<0, π/2> (sin2u)^2du = (1/8) ∫<0, π/2> (1-cos4u)du
= (1/8) [u-(1/4)sin4u]<0, π/2> = π/16
I = ∫<0, π/2> cosu(sinu)^2cosudu = ∫<0, π/2> (sinucosu)^2du
= (1/4) ∫<0, π/2> (sin2u)^2du = (1/8) ∫<0, π/2> (1-cos4u)du
= (1/8) [u-(1/4)sin4u]<0, π/2> = π/16
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