已知sinX=(m-3)/(m+5),cosX=(4-2m)/(m+5),求m的值
问题描述:
已知sinX=(m-3)/(m+5),cosX=(4-2m)/(m+5),求m的值
答
sinx^2+cosx^2=1
所以:((m-3)/(m+5))^2+((4-2m)/(m+5))^2=1