If we know the values of the sine and cosine of x and y, we can find the value of cos(x+y) by using the -Select- State the formula. cos(x+y)- Need Help? Read it 2. 0-2 points SigTrig4 7.2002 0/100 Submissions Used 3. If we know the values of the sine and cosine of x and y, we can find the value of sin(x-y) by using the -Select- State the formula. sin(x - y) = Need Help? Read It O-1 points SigTrig4 72 006 0100 Submissions Used Use an Addition or Subtraction Formula to find the exact value of the expression, cos(255) 4 Formula for Cosine. Formula for Sine.