sin^2A+cos^2A/sinAcosA=-10/3怎么得到 tanA+1/tanA=-10/3

问题描述:

sin^2A+cos^2A/sinAcosA=-10/3怎么得到 tanA+1/tanA=-10/3

(sin^2A+cos^2A)/(sinAcosA)
=sin^2A/(sinAcosA)+cos^2A/(sinAcosA)
= tanA+1/tanA
=-10/3