Answer:
f = 
Step-by-step explanation:
Given
b = fjn ( isolate f by dividing both sides by jn )
= f
Answer:
MY friend the anwser is A I hope this will help plz mark me brainliest
Step-by-step explanation:
Answer: see proof below
<u>Step-by-step explanation:</u>
Given: cos 330 = 
Use the Double-Angle Identity: cos 2A = 2 cos² A - 1

Proof LHS → RHS:
LHS cos 165
Double-Angle: cos (2 · 165) = 2 cos² 165 - 1
⇒ cos 330 = 2 cos² 165 - 1
⇒ 2 cos² 165 = cos 330 + 1
Given: 

Divide by 2: 

Square root: 
Scratchwork: 

Since cos 165 is in the 2nd Quadrant, the sign is NEGATIVE

LHS = RHS 
Wwwooooooowwwww
hh hhhhhhhhhhhhhhhhh
Answer: 4
Step-by-step explanation: