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Definition of Functions

The range of ...

Question

The range of the function $f (x) = c o s^{2} x - 5 c o s x - 6$ is

A

[- 5, 0]

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B

[0, 10]

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C

[- 10, 0]

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D

N o n e

o f

t h e s e

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Solution

The correct option is C $[- 10, 0]$

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