Use the given information to find the exact value of the trigonometric expression.cos ? = - 
; 
< ? < ?
Find cos(2?).
A. - 
B. 
C. - 
D. 
Answer: C
Mathematics
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Combine terms.y3 - 6y4 + 8y2 + y4 - 12y3
A. -6y4 + y3 + 8y2 B. 5y4 + 11y3 - 8y2 C. -5y4 - 11y3 + 8y2 D. -5y8 - 11y6 + 8y2
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Identify the number as prime, composite, or neither.126
A. Prime B. Composite C. Neither
Mathematics
Find the LCD for the fractions in the list.
, 
A. 2x4 B. 8x7 C. x7 D. x4
Mathematics
Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given angle. Give exact answers with rational denominators.Find sec B when a = 9 and b = 2.
A. 
B. 
C. 
D. 
Mathematics