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Equation of Tangent at a Point (x,y) in Terms of f'(x)

Solve the fol...

Question

Solve the following equations.
$tan 3 x - tan x = 0.$

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Solution

$tan 3 x - tan x = 0$
$sin 3 x cos x - cos 3 x sin x = 0$
$sin 2 x = 0$
$2 x = n π, x = n \frac{π}{2} .$

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Equation of Tangent at a Point (x,y) in Terms of f'(x)

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