one over root of 2 or (1/square root of 2) or 1/1.414213562 or 0.707106781
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The sine of 75 degrees is about 0.9659
0.70710678118654752440084436210485 ----------------------- Improve: If you mean 45 degrees then it equals: Sqrt (2) /2 (which is the exact form of the above approximate form)
sine 40° = 0.642788
Sine(30) = 0.5 or 1/2
To find which angle has a sine of 0.13, you calculate arcsin or sin^-1(0.13) =7.47 degrees 7.47 degrees has a sine of 0.13. There is also another angle , below 360 , has a sine of 0.13. Subtract 7.47 from 180. 180-7.47 = 172.53 degrees also has a sine of 0.13.