Establish the identity.sin(4x) = (4 sin x cos x)(2 cos2 x - 1)
What will be an ideal response?
sin(4x) = 2 sin(2x) cos(2x) = (4 sin x cos x)(2 cos2 x - 1).
You might also like to view...
Solve the problem.Find the centroid of the region in the first quadrant bounded by the curve y = 3 cos x and the axes.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Solve the problem.On a Touch-Tone phone, each button produces a unique sound. The sound produced is the sum of two tones, given by y = sin (2?lt) and y = sin (2?ht)where l and h are the low and high frequencies (cycles per second) shown on the illustration.
The sound produced is thus given by y = sin (2?lt) + sin (2?ht)Write the sound emitted by touching the 5 key as a product of sines and cosines.
A. y = 2 sin(566?t) cos(2106?t) B. y = 2 sin(2106?t) cos(566?t) C. y = 2 sin(707?t) cos(2247?t) D. y = 2 sin(2247?t) cos(707?t)
Use Cramer's rule to solve the linear system.
A. {(9, 7, 2)} B. {(10, 5, 2)} C. {(9, -7, -2)} D. {(7, 2, 7)}
The function Y2 is defined as Y1 + k for some real number k. Based upon the given information about Y1 and Y2, find k. 
A. 5 B. 2 C. 1 D. 4