Use the Half-angle Formulas to find the exact value of the trigonometric function. cos 
A. 
B. - 
C. - 
D. 
Answer: D
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Solve the problem.To train for a race, Will begins by jogging 11 minutes one day per week. He increases his jogging time by 6 minutes each week. Write the general term of this arithmetic sequence, and find how many whole weeks it takes for him to reach a jogging time of one hour.
A. ak = 6k + 5; 10 weeks B. ak = 6k + 11; 10 weeks C. ak = 6k + 11; 9 weeks D. ak = 6k + 5; 9 weeks
Write the first five terms of the arithmetic sequence with the given first term a and common difference d.a = 12; d = -3
A. 15, 12, 9, 6, 3 B. 12, 9, 5, 3, 0 C. 9, 6, 3, 0, -3 D. 12, 9, 6, 3, 0
Simplify the trigonometric expression by following the indicated direction.Multiply and simplify: 
Fill in the blank(s) with the appropriate word(s).
Complete the identity.sin2 ? + sin2 ? cot2 ? = ?
A. sin2 ? + 1 B. cot2 ? + 1 C. cot2 ? - 1 D. 1