Complete the identity.csc ?(sin ? + cos ?) = ?
A. 1 + cot ?
B. -2 tan2 ?
C. sec ? csc ?
D. sin ? tan ?
Answer: A
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Find the exact value of the expression.cos 
A. 
B. 
C. 
D. 
Evaluate.
, for x = 10 and y = 53
A. 6 B. 7 C. 5 D. 8
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
Development that occurs in distinct steps or stages, with each stage bringing about behavior that is assumed to be qualitatively different from behavior at earlier stages. This is referred to as what type of change?
A. discontinuous B. continuous C. critical D. natural