sin77(@susan.sin77) • photos and videos. . Log in. Open app. susan.sin77's profile picture. 6 posts. 55 followers. 120 following. susan.sin77.Calculate the value of the sin of 720 ° To enter an angle in radians, enter sin(720RAD) sin(720 °) = -4.89842541528951E-16 Sine, in mathematics, is a tronometric function of an angle.