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高一数学函数计算(要具体过程)着急啊tanα=34sinα-2cosα/5cosα+3sinα=?sinαcosα=?(sinα+conα)^2=?
题目内容:
高一数学函数计算(要具体过程) 着急啊
tanα=3
4sinα-2cosα/5cosα+3sinα=?
sinαcosα=?
(sinα+conα)^2=?优质解答
4sinα-2cosα/5cosα+3sinα
=(4tanα-2)/(5+3tanα)=10/14=5/7
sinαcosα
=sinαcosα/((sinα)^2+(cosα)^2)=tanα/((tanα)^2+1)=3/10
(sinα+conα)^2
=1+2sinαcosα
=8/5
tanα=3
4sinα-2cosα/5cosα+3sinα=?
sinαcosα=?
(sinα+conα)^2=?
优质解答
=(4tanα-2)/(5+3tanα)=10/14=5/7
sinαcosα
=sinαcosα/((sinα)^2+(cosα)^2)=tanα/((tanα)^2+1)=3/10
(sinα+conα)^2
=1+2sinαcosα
=8/5
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