1. ## Trig Proof

i have been trying to crack this but i have had no luck. hope someone can help.

$(sin4x + sin2x)/(cos4x+cos2x) = tan3x$

the X varibale is actually (pie), i just could not type it into the window...

2. Originally Posted by sigma1
i have been trying to crack this but i have had no luck. hope someone can help.

$(sin4x + sin2x)/(cos4x+cos2x) = tan3x$

the X varibale is actually (pie), i just could not type it into the window...
What exactly are you trying to crack?

$\sin(n \pi) = 0$ for $n = \pm 1$, $\pm 2$, ...

$\tan(n \pi) = 0$ for $n = \pm 1$, $\pm 2$, ...

Hence both sides = 0.

3. Oh yeah and the Latex for pi (not pie lol) is...

\pi $\pi$

4. the actual question is prove that

$
(sin4A + sin2A)/(cos4A+cos2A) = tan3A
$