Sum of slopes of common tangent to \( y=\frac{x^{2}}{4}-3 x+10 \) \...

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Sum of slopes of common tangent to \( y=\frac{x^{2}}{4}-3 x+10 \)
\( \mathrm{P} \) and \( y=2-\frac{x^{2}}{4} \) is:
(1) -6
(2) -3
(3) \( 1 / 2 \)
(4) None of these
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