यदि ax + by = c वृत्त x2 + y2 = 16 की स्पर्श रेखा है तो

1
16(a2 + b2) = c2
2
16(a2 - b2) = c2
3
16(a2 + b2) = -c2
4
16(a2 - b2) = -c2

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