which in this case is the product of the denominators x − 1 and x + 1.
The answer is (E).
Here’s a question for which you have a choice. You can answer it just as quickly and easily with or
without a calculator:
Figure 1
You could use your calculator to find out what angle has a sine of 0.5, but you might just know that
it’s 30°. This is a 30-60-90 triangle, and BC is the longer leg, which is equal to the shorter leg times
. Since AC = 1, then . You could use your calculator to find the square root of 3, but you
2. In Figure 1, if sin θ = 0.5, what is the length of BC?
(A) 1.25
(B) 1.41
(C) 1.50
(D) 1.73
(E) 2.00