Find all solutions of the equation in the interval [0, 2?).2 cos2 ? - 3 cos ? + 1 = 0
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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The matrix associated with the solution to a system of linear equations in x, y, and z is given. Write the solution to the system, if it exists.
A. x = -4, y = 0, z = 4 B. x = 0, y = 4, z = -4 C. x = 4, y = 4, z = -4 D. x = -4, y = 4, z = 0
Mathematics
Remove parentheses and simplify the expression.(2x - 5y + 7) - 2(-2x + 5y - 7)
A. -4x + 10y - 14 B. 4x - 10y + 14 C. 6x - 15y + 21 D. -6x + 15y - 21
Mathematics
Solve.
= 3 + 
A. ? B. -5, 8 C. -8, -5 D. 5, 8
Mathematics
Use the quotient rule to divide and simplify.
A. 
B. 
C. 
D. 
Mathematics