Equation of Tangent in Normal Form

Rarely Tested

Equation of Tangent in Normal Form

For:

$$y^2=4ax$$

if the tangent makes an angle $$\theta$$ with the positive $$x$$-axis:

$$y=x\tan\theta+a\cot\theta$$

Usage

- Used when the inclination of the tangent is given instead of its slope.

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