∫(0-π)(sint)^7(cost)^2求积分,在线等.

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∫(0-π)(sint)^7(cost)^2求积分,在线等.∫(0-π)(sint)^7(cost)^2求积分,在线等.∫(0-π)(sint)^7(cost)^2求积分,在线等.∫(0-π)(sin

∫(0-π)(sint)^7(cost)^2求积分,在线等.
∫(0-π)(sint)^7(cost)^2求积分,在线等.

∫(0-π)(sint)^7(cost)^2求积分,在线等.

∫(0-π)(sint)^7(cost)^2dt
=2∫(0-π/2)(sint)^7(cost)^2dt
=2∫(0-π/2)(sint)^7[1-sin²t]dt
=2∫(0-π/2)【(sint)^7-(sint)^9]dt
=2× (6/7*4/5*2/3-8/9*6/7*4/5*2/3)
=8/315