get this: .
Now it’s time to cancel like terms: = −2.
PROBLEM 5. Find .
Answer: Divide each term by x^2.
PROBLEM 6. Find .
Answer: Replace tan x with , which changes the expression into
Because = 1, the = 1 as well. Thus, because = 1 and cos x = 1, the
answer is 4.
PROBLEM 7. Find .
Answer: First, expand and simplify the numerator.
Next, factor h out of the numerator and the denominator.