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Finding the equation of tangent

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Find equation of tangent line in cartesian coordinates. Give in polar coordinates:

r=3-2costheta, at theta=pie divided by 3.

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The transformation formulas to cartesian system are
<br>
<br>x = r cos A, y = r sin A
<br>
<br>where we used A instead of theta convenience,
<br>
<br> r = 3-2Cos(A) at A = pi/3
<br>
<br>If A = pi/3,
<br>
<br> r = 3-2cos(pi/3) = 3-(2x0.5) = 3-1= 2 (because Cos 60 = 0.5)
<br>
<br>Now, x = r cos(pi/3) = 2 x 0.5 = ...

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