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If costheta=3/5 and cosphi=4/5, where th...

If `costheta=3/5` and `cosphi=4/5`, where `theta` and `phi` are positive acute angles, then `cos((theta-phi)/2)=`

A

`7/sqrt2`

B

`7/(5sqrt2)`

C

`7/(sqrt5)`

D

`7/(2sqrt5)`

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