O D. V2- V2 42. Use the half-angle formulas to find the exact values. tan 67 30' = O A. - 1 + 12 O B. - 1 - 12 O c. 1- VZ D. 1 + 12 43. Express this product as an algebraic sum: 2 sin 30sin 50. A. -Cos 80+ cos 20 B. COS 80 - Cos 20 O c . -Cos 80 - cos 20 O D. COS 86+ Cos 28 44. Express this product as an algebraic sum: sin 25 cos 180 O A. [- sin 430 - sin 79] O B. 4 [sin 430 + sin 70] O c. 4 [- sin 430 + sin 79] O D. [sin 430 - sin 79] https://theorem.nebraska.edu/courses/MTHH044059/unit-3/unit-3-evaluation 18/20 7/7/2021 Precalculus: Trigonometry - Theorem 45. Express this algebraic sum as a product: cos 42 + cos 180 A. -2 sin 30 sin 120 B. 2 sin 30 sin 120 O C. 2 cos 30 Cos 12 O D. -2 COS 30 COS 120 46. Express this algebraic sum as a product: sin 36 - sin 320 A. -2 cos 340 sin 20 O B. 2 cos 34' sin 20 O c. 2 sin 34 cos 20 O D. -2 sin 340 cos 20 47. Find the value of this expression: sin 45 sin 150 . The second step = O A. ~ [sin 600 - sin 309] O B. 4 [COS 600 + cos 309] O c. 4 [sin 600 + sin 309] O D. 4 [-COS 60 + cos 309] 48. What us the value of sin 45 sin 150 2 O A. V3 + 1 4 O B. V3-1 O c. = 1- V3 O D. 1- V3 4