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

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

A

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

B

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

C

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

D

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

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The correct Answer is:

A

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