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If a= ( 1)/( 5 cos x+ 12 sin x) then for...

If `a= ( 1)/( 5 cos x+ 12 sin x)` then for all real x

A

the least positive value of a is `(1)/(13)`

B

the greatest negative value of a is `-(1)/(13)`

C

`a le (1)/(13)`

D

`-(1)/(13) le a le (1)/(13)`

Text Solution

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The correct Answer is:
A, B
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