Complete the identity.
= ?
A. tan (3?) + tan (6?)
B. 
C. 
D. 
Answer: C
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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
Complete the identity.sin 
cos 
= ?
A. 
B. 
C. 
cos ?
D. 
sin ?
Find the exact value of the expression.cos 
A. 
B. 
C. 
D. 
Which of Bronfenbrenner's bioecological levels provides the connections between the various aspects of a person's life?
A. exosystem B. mesosystem C. microsystem D. macrosystem