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So for another one, I have
4tanxcos²x-2tanx/1-tan²x=2tanx/1-tan²x.
So far, I have simplified it to 2tanxcos²x/1-tan²x.
Could I set up a proportion setting my identities equal to each other?

THank you !

I have no idea how to solve this!
It's about Verifying trigonometric identities.
Here's the problem:

1 divided by 1+tanx = cotx divided by 1+cotx