Question

tanx - cotx = - 2cot2x

Answer 1

identity ?
solving an equation?

Answer 2

identify, please

Answer 3

identity it bet is what you mean
Well first off one side you have double angle and the other side you don't.

Answer 4

So I would first rewrite the side that has a double angle

Answer 5

or i mean we could try to write the left side with double angle instead if you want

Answer 6

so lets try that

Answer 7

lets take the left hand side and write it in terms of cos and sin for now

Answer 8

then combine the fractions on the left hand side

Answer 9

let me know what you have after doing that

Answer 10

once you have the fractions combine
it should be obvious to you what double angle identities you can use

Answer 11

are you there?