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.

12 divide by 1.8 then round down
Answer:
X=35
Step-by-step explanation:
simplify 7/9
x/45-7/9=0
simplify x/45
x - (7 • 5)/45= x - 35/45
x-35/45=0
add 35 to both sides
x=35
I tried it's hard to write it all out on here i just to give u the best sorry :)