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If a le 3 cos x + 5 sin ( x - pi//6) le...

If `a le 3 cos x + 5 sin ( x - pi//6) le b` for all `x ,` then `( a, b)` is

A

`(- sqrt(19) , sqrt(19) )`

B

`( - 17, 17)`

C

`(- sqrt( 21) , sqrt(21) )`

D

none of these

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The correct Answer is:
A
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AAKASH SERIES-PERIODICITY AND EXTEME VALUES-PRACTICE SHEET (EXERCISE) LEVEL-I(MAIN) Extreme values ( Single answer type questions )
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