Use a graphing calculator to determine which expression completes the identity.The expression 
+ 
is to be the left hand side of an equation that is an identity. Which one of the following four expressions can be used as the right hand side of the equation to complete the identity?
A. 3 sec ?
B. 1 - cos ?
C. tan2 ?
D. 2 sec2 ?
Answer: D
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Simplify.eln x2
A. x B. ex2 C. x2 D. ln x2
Consider the differential equation. A detailed direction field is not needed. Find the solutions that are constant, for all 
(the equilibrium solutions). In what regions are solutions increasing? Decreasing?y'(t) = (y - 3)(y + 9)
A. y = 3, y = -9; increasing for -9 < y < 3; decreasing for y < -9 or y > 3 B. y = -3, y = 9; increasing for -9 < y < 3; decreasing for y < -9 or y > 3 C. y = -3, y = 9; increasing for y < -9 or y > 3; decreasing for -9 < y < 3 D. y = 3, y = -9; increasing for y < -9 or y > 3; decreasing for -9 < y < 3
Find the unknown complementary or supplementary angle.
A. 53° B. 73° C. 58° D. 63°
Perform the indicated operation and simplify.
- 
A. 11
B. 
C. 
D. 