Prove the identity.cos 
= -sin x
What will be an ideal response?
cos 
= cos x cos 
- sin x sin 
= (cos x)(0) - (sin x)(1) = - sin x.
Mathematics
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The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds). s (m)
When is the body moving forward?
A. 0 < t < 1, 3 < t < 4, 5 < t < 7, 9 < t < 10 B. 0 < t < 1, 3 < t < 4, 5 < t < 7 C. 0 < t < 8 D. 0 < t < 3, 3 < t < 5, 5 < t < 8
Mathematics
Determine whether the given number is a solution of the equation. 
+ x = -8; x = - 
A. Yes B. No
Mathematics
Write a formula for the general term, or nth term, for the given sequence.-2, 4, -8, 16, -32, . . .
A. an = (-1)n(2n) B. an = -2 + 2(n - 1) C. an = (-1)n(2)n D. an = (-1)n - 1(2)n
Mathematics
Solve the system of equations by graphing.
?
What will be an ideal response?
Mathematics