sin2πt\sin 2 \pi tsin2πt
2πsin(2πt)2 \pi \sin (2 \pi t)2πsin(2πt)
2πcos(2πt)2 \pi \cos (2 \pi t)2πcos(2πt)
cos(2πt)\cos (2 \pi \mathrm{t})cos(2πt)