Answer:

Step-by-step explanation:
We want to solve
, where
.
We rewrite in terms of sine and cosine.


Use the Pythagorean identity:
.




This is a quadratic equation in
.
By the quadratic formula, we have:




or 
or 
or 
When
, 
on the interval
.
When
,
is not defined because 
Answer:
About 1/5 or 20%
Step-by-step explanation:
If the pie is cut in slices equal to the one eaten, there will be 5. And since one is eaten there are 4/5 left, or 1/5 taken.
Answer:
i think 2-3 min.
Step-by-step explanation: i wish it's help u
Answer:
the original number is 7
Step-by-step explanation:
7•4 = 28
28+12=40