已知实数x,y满足想x^2/9+y^2/16=1 求x+y+10的取值范围由参数方程可知x=4cosα,y=3sinαx+y=4cosα+3sinα别人做的下一步是x+y=5sin(a+b),这道题还有没有其他方法可解?

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