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If cos theta = 3/5 and cos phi =4/5, whe...

If `cos theta = 3/5 and cos phi =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)`

A

`(7)/(sqrt2)`

B

`(7)/(5sqrt2)`

C

`(7)/(sqrt5)`

D

`(7)/(2sqrt5)`

Text Solution

Verified by Experts

The correct Answer is:
B
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