Question

determine the following identity: 1 = cos2A on
cos2A
equals : tan2A on
tanA

Answer 1

Substitute
\[\cos2A = {2\tan A \over 1+\tan^2 A}\]
and you will get your answer

Answer 2

Is this your question

\[{1- \cos 2A \over \cos 2A}={\tan 2A \over \tan A}\]

Answer 3

@Luahn ??

Answer 4

yes thats the question please

Answer 5

but its + cos2A

Answer 6

1+ co2A

Answer 7

Ok. just write it as
\[{1+ \cos 2A \over \cos 2A}\]

Now substitute instead of cos 2A,

\[\cos2A = {2\tan A \over 1+\tan^2 A}\]
and simplify

Answer 8

i need to prove that 1+cos2A
cos 2A

equals: tan2A
tanA

Answer 9

can i please have the method of getting to the answer