How to find the equation of a line tangent to a circle

1 Given the parabola f(x) = x^2 , find the points at which the tangent line is parallel to the bisector of the first quadrant. Find the equation of the

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Rect tangent to circles

FIGURE 7.26. Tangent to the circle through a point exterior to it Let the circle (x - a)²+(y-b)²= R2 and a point exterior to it, P(Xo, I).
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Exercises of the equation of the tangent line and normal

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