數學三問

[ruby0519]

如附件

[thepiano]

dream10 老師假設 y = sinθ

cosθ = √(1 - y^2)

θ = arcsiny

(1/2)sin2θ = sinθcosθ = y√(1 - y^2)

2∫√(1 - y^2)dy = y√(1 - y^2) + arcsiny + C

[dream10]

抱歉~~忘記替換回來

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