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If a sin x + b cos ( x+ theta) + b cos (...

If `a sin x + b cos ( x+ theta) + b cos ( x-theta)=d`, then the minimum of `| cos theta|` is equal to

A

`(1)/(2|b|)sqrt(a^(2) - b^(2))`

B

`(1)/(2|a|)sqrt(d^(2) - a^(2))`

C

`(1)/(2|d|)sqrt(d^(2) - a^(2))`

D

none of these

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A
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