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Maths-

General

Easy

Question

If the function $f left parenthesis x right parenthesis equals c o s invisible function application vertical line x vertical line minus 2 a x plus b$ increases along the entire number scale, the range of value of a is given by

$a \leq b$
$a = \frac{b}{2}$
$a \leq - \frac{1}{2}$
$a \geq - \frac{3}{2}$

The correct answer is: $a less or equal than negative 1 half$

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