Suppose we let
, so that
.
Also, recall the double angle identity for cosine:

So, we can rewrite and compute the integral using the substitution, as





Answer:
21.64
Step-by-step explanation:
7.7+0.94+13=21.64
Answer:
She earned $60
Step-by-step explanation:
Since she had 20 dollars remaining from may, she earned the rest of the money in june so:
80-20=60
Answer:

combine terms
subtract x from both sides and add 1 to both sides

Answer is A