Given that Q is approximately (0.259,0.966) is a point on the unit circle with angle 75 degrees, estimate sin 285 degrees and cos 285 degrees without a calculator.
Given that Q is approximately (0.259,0.966) is a point on the unit circle with angle 75 degrees, estimate sin 285 degrees and cos 285 degrees without a calculator.
I am stuck!
Ok use a reference angle for 285. So the reference angle would be 75.
Now use sum identity formula
Last edited by 11rdc11; Oct 27th 2008 at 02:47 PM.