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Question

If for the ellipse x2a2+y2b2=1,S1=x21a2+y21b2−1, for point (x1,y1), Which of the following is true


A
S1=0(x1,y1) is on the ellipse
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B
S1>0(x1,y1) is inside the ellipse
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C
S1<0(x1,y1)is outside the ellipse
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D
S1>0(x1,y1) is outside the ellipse
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