Prove the identity.cos
= -sin x.
What will be an ideal response?
Using the sum identity,
cos
= cos(x) cos
- sin(x) sin
.
= cos(x) ? 0 - sin(x) ? 1 = - sin x.
Mathematics
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For f(x) = A sin 
+ D,identify either A, B, C, or D as indicated for the sine function.y = 4 sin 
Find A.
A. 4
B. 2
C. 8
D. 
Mathematics
Solve the inequality and write the solution set using interval notation; then graph the solution set on a number line. v2 + 2v - 24 ? 0
A. [4, ?)
B. [-6, 4]
C. (-?, -6]
D. (-?, -6] ? [4, ?)
Mathematics
Find the annual straight-line rate of depreciation for the estimated life.70 years
A. 0.7% B. 70% C. 1.4% D. 0.1%
Mathematics
Solve the problem.A number minus 20 times its reciprocal is 1. Find the number.
A. 5 B. -5 or 4 C. 5 or -4 D. 5 or 4
Mathematics