Find the exact value of each expression. 55. sin 5° cos 40°+ cos 5° sin 40° 56. cos 22.5° Use the information given about the angle to find the exact value of the indicated trigonometric function. 3 57. cose, 0 is in Q IV, Find sin 20. 5' Write the product as a sum. 58. cosxsin 4x Write the sum as a product. 59. cos 4x-cosбx