Answer:
21
Step-by-step explanation:
yeah 2+2 is 21 thanks for the very nonexistent question
You want to end up with
. Expand this using the angle sum identity for sine:

We want this to line up with
. Right away, we know
.
We also need to have

Recall that
for all
; this means

Then

So we end up with

Step-by-step explanation:

Answer:
Answer should be 5
Step-by-step explanation: