原式=(sinθ/cosθ+cosθ/sinθ)cos²θ
=[(sin²θ+cos²θ)/(sinθcosθ)]cos²θ
=[1/(sinθcosθ)]cos²θ
=cosθ/sinθ
=cotθ
化簡(tanθ+cotθ)cosθ^2
化簡(tanθ+cotθ)cosθ^2
其他人氣:279 ℃時間:2020-01-23 22:54:39
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