(2sin^x+sin2x)/(1＋tanx)化简

分类: 作业答案 • 2022-01-09 18:04:21

问题描述：

答

(2sin^x+sin2x)/(1＋tanx)
=(2sinx^2+2sinxcosx)/(1+sinx/cox)
=2sinx(sinx+cosx)/[(sinx+cosx)/cosx]
=2sinxcosx
=sin2x.