How to use polar derivative formula in matlab?

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Closed: madhan ravi on 7 Jun 2020

How to use polar derivative formula in matlab? To find the value of slope at tangent to certain point?

Polar derivative Formula:

dydx(phi0)=(drdphi(phi0)*sin(phi0)+r(phi0)*cos(phi0))/(drdphi(phi0)*cos(phi0)-r(phi0)*sin(phi0));

Example Question:

From the curve below, find the slope of tangent at pi/4

r=5(cos(φ)+1)

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