Complete the identity.cos ? - cos ? sin2 ? = ?
A. sin ?
B. cos3 ?
C. sec2 ?
D. tan2 ?
Answer: B
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Complete the sentence: On an annual basis the first set of expenses is ____ % of the second set of expenses.Elena spends $4 per day on a coffee at the neighborhood cafe and $360 per month on food.
A. 5% B. 8% C. 34% D. 406%
Determine whether the given sequences are equal to each other.(k2 -9) and (k + 3)(k - 3)
A. equal B. not equal
Simplify the expression.4 sin ? cos3 ? - 4 sin3 ? cos ?
A. sin 2? cos 2? B. 4 sin ? cos ? C. sin 4? D. 4 sin ? cos ? cos 2?
Dr. Sardonicus wants to examine the effectiveness of different teaching techniques. Her 9:00 a.m. class will be exposed to a new method of viewing online instructional videos while her 10:00 a.m. class will be exposed to traditional lectures. She will assess the students' memory of the information across six sessions. What method is the professor using to test her ideas?
A. intuitive B. sociological C. anecdotal D. scientific