Verify the identity.sin x(sin x + sin 5x) = cos 2x (cos 2x - cos 4x)
What will be an ideal response?
sin x(sin x + sin 5x) = sin x(2 sin 3x cos 2x) = 2 cos 2x sin x sin 3x
= cos 2x (cos 2x - cos 4x)
You might also like to view...
Factor the expression completely. If the polynomial is prime, state this as your answer.4x2 + 4x + 1
A. prime B. (2x + 1)(2x - 1) C. (x + 2)2 D. (2x + 1)2
The following line graph shows the number of hours needed to prepare for various tests. Use the graph to answer the question.
How many more hours were needed to prepare for Test 4 than for 
.
A. 1 B. 4 C. 2 D. 3
Solve the equation.
+ 4 = 11
A. 
B. 
C. 
D. ?
Find the slope and the y-intercept of the line whose equation is x = 8.
a. The slope is 0; y-intercept is (0, -8). b. The slope is -8; y-intercept is (0, 8). c. The slope is undefined; there is no y-intercept. d. The slope is 8; y-intercept is (0, 0).