sin77Calculate 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.Listen to music by Sin Sin 77 on Apple Music. Find top songs and albums by Sin Sin 77 including Dullaire, Nunu and more.