证明 2(sin2a+1)/1+sin2a+cos2a=tana+1

分类: 作业答案 • 2021-12-28 11:25:00

问题描述：

证明 2(sin2a+1)/1+sin2a+cos2a=tana+1
2(sin2a+1)/1+sin2a+cos2a=tana+1

答

2(sin2a+1)/1+sin2a+cos2a
=2(sina+cosa)2/[2cosa(sina+cosa)]
=(sina+cosa)/cosa
=tana+1