1.

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

Answer»

`(1)/( 2 |B|) SQRT( d^(2) - a^(2) )`
`(1)/( 2 |a|) sqrt( d^(2) - a^(2) )`
`(1)/( 2 |d|) sqrt( d^(2) - a^(2) )`
NONE of these

Answer :A


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