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Use of Trigonometric Table

Let y=cosxc...

Question

Let $y = cos x (cos x - cos 3 x)$ . then $y$ is

\geq 0

only when

x \geq 0

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\leq 0

for all real

x

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\geq 0

for all real

x

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\leq 0

only when

x \leq 0

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Solution

The correct option is C $\geq 0$ for all real $x$

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