Help Verify a Trig. Identity
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Help Verify a Trig. Identity

[From: ] [author: ] [Date: 11-11-26] [Hit: ]
!This is not an identity, so you shouldnt be able to prove it.suppose x is 45 degrees.Maybe you made a mistake typing the problem?As written,......
I need to prove the following.

4tanx = [4tanx - 4tan^3(x)] / [1 - 6tan^2(x) + tan^4(x)]

I know that I can do tan2x = [2tanx] / [1-tan^2(x)], but that's about all.

Please show me how to do this!!!

-
4tanx = [4tanx - 4tan^3(x)] / [1 - 6tan^2(x) + tan^4(x)]

This is not an identity, so you shouldn't be able to prove it.

Here's how you can see that it is not true:

suppose x is 45 degrees. Then tan x = 1
left hand side = 4 But the numerator of the right hand side is (4-4)=0

Maybe you made a mistake typing the problem?

As written, the problem only involves tan(x), no multiple angles are involved.
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