Answer:
Step-by-step explanation:
Several trig identities are involved in the proof of this. This is the order in which they are used.
- cos(2x) = cos²(x) -sin²(x)
- cos²(x) +sin²(x) = 1
- cos(x) = 1/sec(x)
<h3>Proof</h3>
Starting with the left side, we can transform it into the right side.

Answer:
105
Step-by-step explanation:
l is parallel m so angle 3+angle 6=180
Answer:
C
Step-by-step explanation:
Hope this helps <3
Stay safe!
Get good grades :)
Stay awsome
~ Coco
Answer:

Step-by-step explanation:

