证明tanα-cotα=(1-2cos^2α)/(sinαcosα)
人气:206 ℃ 时间:2019-10-11 05:50:19
解答
tanα-cotα
=sinα/cosα-cosα/sinα
=[sin^2α-cos^2α)/sinαcosα
=(1-2cos^2α)/sinαcosα
推荐
- 证明1-2cos^2θ/tanθ-cotθ=sinθcosθ
- 证明tanθ×((1-sinθ)/(1+cosθ))=cotθ×((1-cosθ)/(1+sinθ))
- 证明:(1+tan a+cot a)/(1+tan^2 a+tan a)-cot a/(1+ tan^2 a)=sin a*cos a
- sin,cos,tan,cot,分别是哪边对哪边
- 证明:tanα+cotα=(sinαcosα)后分之1.
- 1选A,2选B,我不确定答案,
- Would you like to fly a kite with me?Sorry,I h_______ ever have time for a game
- 取三支干净的小试管,试管A盛有开始蒸馏出的液体,试管B装有蒸馏一段时间后收集的,试管C放入没蒸馏的硬水
猜你喜欢