Most scientific calculators come with a button that says SIN, or they have it under a secondary option usually accessed by pressing the SHIFT or 2ND first then the key sub labeled SIN.
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The sine of 1 (rad) is 0.8414709848078965066525023216303.The sine of an angle of 1 degree (from the computer's calculator) is 0.017452406 (correct to 9 decimal places).
You can calculate that on any scientific calculator. Just make sure that the calculator is set to "degrees". As a check, the sine of 90° should come out as exactly 1.
Try calculating the sine functions on a scientific calculator, then do the division. And make sure the calculator is set to the correct angular measurement (radians, or degrees, whatever you want to calculate).
Sine can be found in degrees by taking the length of the opposite side and hypoteneuse. Then divide the opposite side by the hypoteneuse. Any calculator can be used to find this. for example, if the hypoteneuse side was 7, and the opposite side was 3, and you labeled the angle "A", then it would be "sineA= 3/7" ...... then A=sin^-1 (3/7) and you put that in your calculator and the answer you get is the angle in degrees (if the calculator is in degrees mode, and if the angle is an acute angle).
sine tables, that's how they did it before calculators, there are formulas as well