Use the accompanying table to find the solutions to the given equation on 
2 cos2 ? + cos ? - 1 = 0
Y1 = 2(cos(X))2+cos(X)-1
A. 0°
B. 120°, 240°
C. 60°, 180°, 300°
D. None
Answer: C
Mathematics
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A system of two linear equations in two unknowns can be solved graphically.
Answer the following statement true (T) or false (F)
Mathematics
Find fx, fy, and fz.f(x, y, z) = 
A. fx = - 
; fy = - 
; fz = - 
B. fx = 
; fy = 
; fz = 
C. fx = 
; fy = 
; fz = 
D. fx = - 
; fy = - 
; fz = - 
Mathematics
Factor completely. If unfactorable, indicate that the polynomial is prime.49 - (x + 4y)2
A. (7 + x + y)(7 - x - y) B. (7 + x + 4y)(7 - x - 4y) C. (7 + 4xy)(7 - 4xy) D. (7 + x - 4y)(7 - x - 4y)
Mathematics
Find the value of the rational expression for the given value. Make sure your fi nal answer is simplified completely.
; x = -9
A. 
B. 
C. 
D. 
Mathematics