求证明极限lim(x,y)->(0,0) (x^2 * sin^2y)/x^2 +9y^2 =0如题,求证明该极限=0

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求证明极限lim(x,y)->(0,0)(x^2*sin^2y)/x^2+9y^2=0如题,求证明该极限=0求证明极限lim(x,y)->(0,0)(x^2*sin^2y)/x^2+9y^2=0如题,

求证明极限lim(x,y)->(0,0) (x^2 * sin^2y)/x^2 +9y^2 =0如题,求证明该极限=0
求证明极限lim(x,y)->(0,0) (x^2 * sin^2y)/x^2 +9y^2 =0
如题,求证明该极限=0

求证明极限lim(x,y)->(0,0) (x^2 * sin^2y)/x^2 +9y^2 =0如题,求证明该极限=0
x^2/(x^2+9y^2)0
所以由夹逼法则,
lim(x,y)->(0,0) (x^2 * sin^2y)/(x^2 +9y^2) =0