Sum and Difference Formulas: sin(A+B)=sin A cos B + cos Asin B sin(A B) sin Acos B-cos Asin B cos(A+B)=cos A cos B-sin A sin B cos(A-B) cos A cos B+ sin Asin B tan A+ tan B 1-tan Atan B tan(A+B) = tan A-tan B tan(A-B)= 1+ tan Atan B Double Angle Formulas: 1-sin A sin 24 2sin Acos A cos 24 = cos A- =1-2 sin A = 2 cos A-1 tan 2.4 = 2 tan A 1- tan A tan Half Angle Formulas: sin n(A). A = cos 24 tan = A = (1/4) ()- Or ... cos A 2 1+ cos A 2 1-cos A 1+ cos A 1- cos A sin A = sin A 1+ cos A ***IMPORTANT: THE ABOVE FORMULAS WILL NOT BE PROVIDED ON THE FINAL EXAM*** 35. Find the exact value of sin 15 36. Find the exact value of sin 75 37. Find the exact value of cos -157.5. 38. Find the exact value of cos 8 39. If cosA = , and A lies in quadrant IV, and cosB = = 13 and