The least value of the function phi(x)=i...

The least value of the function `phi(x)=int_((7pi)/6)^(x)(4sint+3cost)dt` on the interval `[(7pi)/6,(4pi)/3]` is

A

(a) `(sqrt(3)+1)/2`

B

(b) `(sqrt(3)-1)/2`

C

(c) `(7(1-sqrt(3)))/2`

D

(d) `-((sqrt(3)+1)/2)`

Verified by Experts

The correct Answer is:

C

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