Answer: S^64
Step-by-step explanation:
S^4 - 4.4.4 = 64
I believe if you simply everything, you will get 17381 over 20 or 17381/20
It is D, because looking at a unit circle, 5pi/3 is about the same location as -sqrt3 which is approximately 1.4.
52x38=1976, 1976 is the answer