Find the exact value of the trigonometric expression without the use of a calculator.sin 200° cos 80° - cos 200° sin 80°
A. 
B. - 
C. - 
D. 
Answer: A
Mathematics
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Find the median of the data set.12, 22, 33, 54, 72, 75, 86
A. 33 B. 51 C. 54 D. 72
Mathematics
Use Gaussian elimination and matrices to solve the system of linear equations. Write your final augmented matrix in triangular form and then solve for each variable using back substitution.x - y + 4z=164x + z= 5x + 5y + z=25
A. (0, 4, 5) B. (5, 4, 0) C. (0, 5, 4) D. (5, 0, 4)
Mathematics
Determine the period of the function and sketch its graph.y = cos 
A. period: 6?
B. period: 3?
C. period: 6?
D. period: 6
Mathematics
Evaluate the expression.
-2/3
A. 
B. - 
C. 
D. 
Mathematics