この関数は Google スプレッドシートでも Excel と同じように機能します。構文も引数も同じです。
SIN(number)The SIN function calculates the sine of an angle provided in radians. If your angle is in degrees, you must multiply it by PI()/180 or use the RADIANS function to convert it before calculating.
=SIN(PI()/2)結果: 1
Calculates the sine of PI/2 radians (90 degrees), which is 1.
=SIN(RADIANS(30))結果: 0.5
Converts 30 degrees to radians and calculates the sine, which is 0.5.
This usually happens because the input is in degrees instead of radians; use the RADIANS function to convert it.