来自陈彦彪的问题
化简:cos^2θcotθ+sin^2θtanθ+2cosθsinθ
化简:cos^2θcotθ+sin^2θtanθ+2cosθsinθ
1回答
2020-08-0819:55
化简:cos^2θcotθ+sin^2θtanθ+2cosθsinθ
化简:cos^2θcotθ+sin^2θtanθ+2cosθsinθ
原式=cos^3θ/sinθ+sin^3θ/cosθ+2cosθsinθ=(cos^4θ+sin^4θ)/(sinθcosθ)+2cosθsinθ=(cos^4θ+sin^4θ+2cos²θsin²θ)/(sinθcosθ)=(cos²θ+sin²θ)²/(sinθcosθ)=1/(sinθc...