cot x=(-6/7),求sec xPi扫码下载作业帮搜索答疑一搜即得
问题描述:
cot x=(-6/7),求sec x 扫码下载作业帮
Pi
搜索答疑一搜即得
答
cot x=(-6/7)=cosx/sinx , -6sinx=7cosx , 36sin^2x=49cos^2x=36-36cos^2x , cos^2x=36/85
cosx=6√85/85 ,
secx=√85/6