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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)`

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A, B
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