(sqrt 2) / 2
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The sine of 75 degrees is about 0.9659
sine 40° = 0.642788
Sine(30) = 0.5 or 1/2
Sin(-225) = 0.7071 ... = 1/sqrt(2) = sqrt(2) / 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.