For the circle

MATHEMATICS · Single correct · AP · Calculus AB · Differentiation: Definition and Fundamental Properties · Differentiation: Definition and Fundamental Properties

Problem

For the circle x2+y2=a2x^2 + y^2 = a^2, the slope of the tangent at a point (x1,y1)(x_1, y_1) on the circle is (a) x1y1\dfrac{x_1}{y_1} (b) −y1x1-\dfrac{y_1}{x_1} (c) −x1y1-\dfrac{x_1}{y_1} (d) y1x1\dfrac{y_1}{x_1}

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