Addition and subtraction formulas for sine, cosine and tangent. Use the addition and subtraction formulas for sine, cosine and tangent to calculate the following expressions: 1: cos(x)∙ sin(y) cos(x)∙ cos(y) cos(x) sin(y) 2: tan(x) cot(x) sin(x) cos(x) 3: sec(x) tan(x) cos(x) sin(x) 4: tan(x) 0 cos(x) sin(x) 5: 6: 7: sin(x) sin(x) + cos(x) sec(x) tan(x) 8: -tan(x) tan(x) 1 - tan(x) cot(x) Press the Submit button to see the results.