已知sinθ=(m-3)/(m+5),cosθ=(4-2m)/(m+5)(π/2

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/05 11:46:20
已知sinθ=(m-3)/(m+5),cosθ=(4-2m)/(m+5)(π/2
x){}K356I/B8ߠodTO.;rm{ԱEmb` 40[b&V(mTC<ݻ95ն6452LPZ WTI1[grm- "<ٱ yva

已知sinθ=(m-3)/(m+5),cosθ=(4-2m)/(m+5)(π/2
已知sinθ=(m-3)/(m+5),cosθ=(4-2m)/(m+5)(π/2

已知sinθ=(m-3)/(m+5),cosθ=(4-2m)/(m+5)(π/2
∵sin²θ+cos²θ=1
∴(m-3)²/(m+5)²+(4-2m)²/(m+5)²=1
∴(m-3)²+(4-2m)²=(m+5)²
即m²-6m+9+16-16m+4m²=m²+10m+25
即25-22m+4m²=10m+25
即-32m+4m²=0
即m=0,或m=8
因为π/2