sin77Note that sin77° is periodic: sin (77° + n × 360°) = sin 77 degrees, n$hspace in hspace mathbb$. There are more formulas for the double angle (2 × 77°), halfCalculate 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.