Graph the function on the indicated interval.y = sin (?x) - 3 cos (2x), 0 ? x ? 6.5 
A. 
B. 
C. 
D. 
Answer: A
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Find the local extrema of the function, if they exist.f(x) = -7x2 - 2x - 9
A. Local maximum at 
B. Local minimum at 
C. Local maximum at 
D. Local maximum at 
Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = cos4 x
A. y = u4; u = cos x; 
= 4 cos3 x sin x
B. y = cos u; u = x4; 
= - sin(x4)
C. y = cos u; u = x4; 
= - 4x3 sin(x4)
D. y = u4; u = cos x; 
= - 4 cos3 x sin x
Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 1
B. 
C. 
D. 
Solve.An elliptical riding path is to be built on a rectangular piece of property that measures 8 mi by 4 mi. Find an equation for the ellipse if the path is to touch the center of the property line on all 4 sides.A = 8 miB = 4 mi 
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1