Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Solve the problem.Find tan 2?. sin ? = 
, ? lies in quadrant II.
A. 
B. 
C. - 
D. - 
Mathematics
Graph the function, showing all asymptotes (those that do not correspond to an axis) as dashed lines. List the x- and y-intercepts.f(x) = 
A. x-intercepts: (-3, 0) and (1, 0) ,
y-intercept: (0, -3) ;
B. No x-intercepts, y-intercept: (0, -4) ;
C. No x-intercepts, y-intercept: (0, 4) ;
D. No x-intercepts, y-intercept: (0, -4) ;
Mathematics
Evaluate.
A. 1.052 x 1013 B. 1.052 x 1012 C. 2.104 x 1013 D. 1.052 x 1014
Mathematics
Solve the equation by completing the square.0.5m2 + 0.8m + 0.2 = 0
A. 
B. 
C. 
D. 
Mathematics