if tan(1/2)x=2/5 and

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/12 16:02:20
iftan(1/2)x=2/5andiftan(1/2)x=2/5andiftan(1/2)x=2/5andsinx=2tan1/2x/(1+tan²1/2x)=(4/5)/(1+4/25)

if tan(1/2)x=2/5 and
if tan(1/2)x=2/5 and

if tan(1/2)x=2/5 and
sinx=2tan1/2x/(1+tan²1/2x)
=(4/5)/(1+4/25)
=20/29