SINE() returns the numeric sine of an angle that is expressed in radians.
SINE(radians)
SINE() returns the numeric sine of the measurement of the desired angle in radians.
Note: If your angle is expressed in degrees, use the RADIAN() function to convert the degrees to radians. To round the result of the RADIAN() function, use the DECIMALS() function.
SINE(.7854) = 0.707108079859474
SINE(DECIMALS(RADIANS(45),4))= 0.707108079859474