Which of the following statements are true?

A. It goes \frac{9\pi}{2} radians in two and a quarter revolutions around the unit circle.

B. 2^{\circ}=\pi/90 radians.

C. \sin(\pi/4+26\pi)=\frac{1}{\sqrt{2}}

D. Every complex number can be written in the form r (\cos x + i \sin x) where r \geq 0 and 0 \leq x

E. If n varies over the integers, then \cos(\frac{\pi}{3}n) takes on a finite number of values.

(1 point) Vilka av foljande pastaenden ar sanna? A. Det gar , radianer pa tva och en fjardedels vary runt enhetscirkeln. B. 20 = 1/90 radianer. C. sin (7/4 + 267) = VZ D. Varje komplext tal kan skrivas pa formen r(cost + isin x ) darr > 0och 0