Solve and check.
= 
A. x = 14
B. x = 2
C. x = 36
D. x = 
Answer: C
Mathematics
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Find the exact value. Do not use a calculator.cos ?
A. 0 B. 1 C. -1 D. undefined
Mathematics
Find the exact value of the indicated trigonometric function of ?.tan ? = - 
, 90°< ? < 180°Find cos ?.
A. 
B. -8
C. - 
D. 
Mathematics
Solve using the addition principle.-12 = 27 + f
A. 39 B. -15 C. -39 D. 15
Mathematics
Solve the system by the substitution method.x2 = y2 + 39x - y = 3
A. {(8, 5)} B. {(-8, 5)} C. {(8, -5)} D. {(-8, -5)}
Mathematics