Use the half-angle formulas to determine the exact value of the given trigonometric expression.
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?
?
A. ?
B. ?
C. ?
D. ?
?
E. ?
Answer: D
Mathematics
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Graph the parabola or ellipse. Include the directrix that corresponds to the focus at the origin.r = 
A. 
B. 
C. 
D. 
Mathematics
Use the given transformation to evaluate the integral. src="https://sciemce.com/media/4/ppg__10612191744__f1q61g7.jpg" alt="" style="vertical-align: -4.0px;" /> 
Rwhere R is the parallelepiped bounded by the planes 
A. 
B. 
C. 
D. 378
Mathematics
Solve the problem.A rectangular field is to be enclosed with 1190 feet of fencing. If the length of the field is 75 feet longer than the width, then how wide is the field?
A. 410 ft B. 260 ft C. 365 ft D. 335 ft
Mathematics
Solve.x3 - 2x ? 24 - 5x2
A. [-2, ?) B. [-2, 2] C. (-?, -4] ? [-3, 2] D. [-4, -3] ? [2, ?)
Mathematics