Tangent Line Equation

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Which of the following equations represents the line tangent to a differentiable function $f$ at $x=a$ ?

$y = f(a) - f'(a)(x-a)$

$y = f(a)f'(a)(x-a)$

$y = f'(a) + f(a)(x-a)$

$y = f(a) + f'(a)(x-a)$

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