9) is A
10) is B
Do you need an explanation
Answer:
this app is freakin broken you agree
Answer:
I think its C but I'm not too sure.
Answer:
-4u+4
Step-by-step explanation:
Answer:
:)
Step-by-step explanation:
For simplicity I will substitue
for β.

In the first step I used the identity
And I factored out 
Then it's just simple algebra to cancel till the 3rd step where we used another identity derived from the Pythagorean Theorem.

That's it!