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For the circle x² + y² = 4, find the product of slopes of tangents from (3, 1).
A−3/5
B3/5
C−5/3
D6/5
Answer & Solution
Correct answer: A. −3/5
The product of roots is (y₁² − a²)/(x₁² − a²) = (1 − 4)/(9 − 4) = −3/5.
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