已知角θ的终边过点P(-4m,3m),m≠0,则2sinθ+cosθ=?

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已知角θ的终边过点P(-4m,3m),m≠0,则2sinθ+cosθ=?已知角θ的终边过点P(-4m,3m),m≠0,则2sinθ+cosθ=?已知角θ的终边过点P(-4m,3m),m≠0,则2sin

已知角θ的终边过点P(-4m,3m),m≠0,则2sinθ+cosθ=?
已知角θ的终边过点P(-4m,3m),m≠0,则2sinθ+cosθ=?

已知角θ的终边过点P(-4m,3m),m≠0,则2sinθ+cosθ=?
角θ的终边过点P(-4m,3m),m≠0
x=-4m,y=3m,
r=√(x²+y²)=√(25m²)=5|m|
当m>0时,r=5m
sinθ=y/r=3/5,cosθ=x/r=-4/5
2sinθ+cosθ=6/5-4/5=2/5
当m