Algebra II
posted by Lucy on .
Find the exact value of cos 375 degrees.
Answer: (sqrt6 + sqrt2)/4
Is this correct?

15 deg
sin (30/2)= sqrt [(1cos 30)/2 ]
cos 30 = sqrt 3 /2
sqrt [ (1 sqrt 3/2)/2]
sqrt [ (2  sqrt (3) ) /4 ]
= (1/2) sqrt (2  sqrt 3)