Question

спростити вираз
sin(a-2pi)

Answer 1

sin(a-2pi)=sina*cos2pi-cosa*sin2pi=sina*1-cosa*0=sina

Answer 2

$\sin{(a -2\pi)}=\sin{(-(2\pi-a))}=-\sin{(2\pi-a)}=-(-\sin{\alpha})=\sin{\alpha}$