高数,求定积分,想要过程。。。
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原式=∫[π/4,π/3]xdx/sin²x
=-∫[π/4,π/3]x d(cotx)
=- x cotx|[π/4,π/3]+∫[π/4,π/3]cotx dx
=-(√3π/3 - π/4) +∫[π/4,π/3] d(sinx)/sinx
=π/4 -√3π/3 +ln|sinx||[π/4,π/3]
=π/4 -√3π/3 +ln(√3/2)-ln(√2/2)
=π/4 -√3π/3 +ln(√3/√2)
=π/4 -√3π/3 +½ln(3/2)
=-∫[π/4,π/3]x d(cotx)
=- x cotx|[π/4,π/3]+∫[π/4,π/3]cotx dx
=-(√3π/3 - π/4) +∫[π/4,π/3] d(sinx)/sinx
=π/4 -√3π/3 +ln|sinx||[π/4,π/3]
=π/4 -√3π/3 +ln(√3/2)-ln(√2/2)
=π/4 -√3π/3 +ln(√3/√2)
=π/4 -√3π/3 +½ln(3/2)
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