For what value of x does 6 sin (2x - 25)o attain its maximum value in the range 0o \(\leq\) x \(\leq\) 180o

A.

12\(\frac{1}{2}\)

B.

32\(\frac{1}{2}\)

C.

57\(\frac{1}{2}\)

D.

147\(\frac{1}{2}\)

Correct answer is C

y = 6 sin (2x - 25)o

\(\frac{dy}{dx}\) = -12 cos(2x - 25o)

\(\frac{dy}{dx}\) = 0

-12 cos x (2x - 25o) = 0

= cos(2x - 25o) = 0

= 2x - 25o = cos-1(0)

= 2x - 25o

= 90o

x = \(\frac{115}{2}\)