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Application of Derivative in Geometry

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Formula: Slope of Tangent

Slope of tangent at a point:\[\frac{dy}{dx}\]

Slope of normal: \[-\frac{1}{\frac{dy}{dx}}\]

Maharashtra State Board: Class 12

Key points: Application of Derivative in Geometry

Equation of tangent at (x1,y1): \[y-y_1=\left(\frac{dy}{dx}\right)_{x_1}(x-x_1)\]

Equation of normal:

\[y-y_1=-\frac{1}{\left(\frac{dy}{dx}\right)_{x_1}}(x-x_1)\]

Tangent parallel to X-axis: \[\frac{dy}{dx}=0\]

Tangent parallel to Y-axis: \[\frac{dy}{dx}=\infty\quad(\mathrm{or~}\frac{dx}{dy}=0)\]

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