Establish the identity.cos4 x = 
(3 + 4 cos(2x) + cos (4x))
What will be an ideal response?
cos4 x = cos2 x cos2 x = 
2 = 
(1 + cos(2x))2 = 
(1+ 2 cos(2x) + cos2(2x)) = 
= 
( 3 + 4 cos(2x) + cos(4x)).
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Find the extreme values of the function and where they occur.y = 
A. Absolute maximum is 7 at x = 2. B. Absolute maximum is 7 at x = -2. C. Absolute minimum is 7 at x = 0. D. Absolute minimum is 0 at x = 1.
Plot the point (r, ?).(-2, 315°)
A. 
B. 
C. 
D. 
Estimate an answer to the problem.An advertisement states that television sets are on sale at B&G Electronics. The sale prices are: 
set, $147.99; 
set, $201.95; 
set, $231.99; 27-inch set, $299.97; 
set, $502.97. Estimate the approximate number of 
style="vertical-align: -4.0px;" /> sets that can be bought for $2729. A. 12 B. 19 C. 9 D. 5
Begin by drawing a rough sketch to determine the number of real solutions for the equation y1 = y2. Then use an analytic method to confirm your answer. Give the solution set and any extraneous values that may occur.y1 = 
y2 = x + 4
A. 
No real solutions; ?; no extraneous values
B. 
One real solution; 
; 
is extraneous.
C. 
One real solution; {1}; no extraneous values
D. 
Two real solutions; 
; no extraneous values