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求sin^2θ在[π/6,π/3]上的定积分答案:十二分之派-1/8(根下3-1)
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求sin^2θ 在[π/6,π/3]上的定积分 答案:十二分之派-1/8(根下3 -1)
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答案和解析
sin^2θ =1/2-1/2*cos2θ
∫[π/6,π/3](1/2-1/2*cos2θ)dθ
=(1/2θ-1/4*sin2θ)|[π/6,π/3]
=(1/2*π/3-1/4*sin2*π/3)-(1/2*π/6-1/4*sin2*π/6)
=十二分之派-1/8(根下3 -1)
∫[π/6,π/3](1/2-1/2*cos2θ)dθ
=(1/2θ-1/4*sin2θ)|[π/6,π/3]
=(1/2*π/3-1/4*sin2*π/3)-(1/2*π/6-1/4*sin2*π/6)
=十二分之派-1/8(根下3 -1)
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