Find the indicated sum.
A. 71
B. 90
C. 33
D. 45
Answer: A
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A. 
B. 
C. 
D. 
Use the Half-angle Formulas to find the exact value of the trigonometric function. sin 
A. 
B. - 
C. 
D. - 
Complete the identity.sec ? - 
= ?
A. sin ? tan ? B. sec ? csc ? C. -2 tan2 ? D. 1 + cot ?
In an experiment, the __________ is what researchers expect to change as a result of manipulation.
A. replication group B. independent variable C. control group D. dependent variable