To find the sin of a nonstandard angle we need to use trig identities.
using the difference identity we get...
Now we could use the sin(15) to calculate the sin75 ect...
I hope this helps.
I need a little bit of explanation of how to do something.
for common angles you can find the cordinates and radians easily on charts, such as sin90 is (0,1) pi/2.
for angles like 15 and 75 degrees... how do i find thing. for any angle?