Use the given substitution to express the given radical expression as a trigonometric function without radicals. Assume that 0 < ? < ?/2.Let x = 4 sec ? in 
.
A. 
sin ? cos ?
B. 
sin ?
C. 
sin ? cot ?
D. 
cos ?
Answer: A
Mathematics
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Express the given quantity in terms of sin x or cos x.cos (6? + x)
A. -cos x B. cos x - sin x C. cos x D. -sin x
Mathematics
Solve the problem.A platform has the shape of a frustum of a cone. Find its centroid if the radii of its bases are 2.00 ft and 9.00 ft and the height between bases is 7.00 ft.
A. 2.19 ft from the center of the larger base B. -0.0777 ft from the center of the larger base C. 9.08 ft from the center of the larger base D. 6.81 ft from the center of the larger base
Mathematics
If y varies inversely as x, find the inverse variation equation for the situation.y = 15 when x = 3
A. y = 
B. y = 
C. y = 
D. y = 5x
Mathematics
Find the indefinite integral.
?
?
A. 
B. 
C. 
D. 
Mathematics