cot^2x=2tan^2y+1 求sin^2y+2sin^2x

分类: 作业答案 • 2021-12-31 22:47:39

问题描述：

cot^2x=2tan^2y+1 求sin^2y+2sin^2x
可以的话请写上过程

答

cot^2x=2tan^2y+1 ,
cot^2x+1=2tan^2y+2,
1/(sinx)^2=2/(cosy)^2,
(cosy)^2=2(sinx)^2,
1-(siny)^2=2(sinx)^2,
(siny)^2+2(sinx)^2=1.