Help with my trigonometry

[Maor]

So I have a test tomorrow and I'm stuck at one question.
I need to prove these two equations equal.
sin^4a-cos^4a = sin^2a-cos^2a

Now, I have no idea what I can do from here, or how can I proceed, help please?

[Ad Bot]

[snot2]

they are the same but one has a 2 instead of a 4

[Maor]

they are the same but with a 2 instead of a 4

Snot, this is a serious moment.

[Jetlok]

[WhoDa?]

Maybe because both equal 1?

[Maor]

Maybe because both equal 1?

Explain.

[A.R.C.]

Trigga-brother-nometry.

[Kalphiter]

[Cheemo]

-lolsnip-

I'm glad I have a few years before my senior year.

[Randomguy]

I'm haven't even taken trigonometry yet, so I'm probably wrong, but I felt like trying since mostly everyone else that posted in here was being useless.

sin = 3/5
cos = 4/5
tan = 3/4
a = 1

3/5^4a - 4/5^4a = 3/5^2a - 4/5^2a
81/625 - 256/625 = 9/25 - 16/25
-175/625 = -7/25

-175/625 simplifies to be -7/25. Not sure if that proves it or not. Feel free to correct me if I'm wrong.

[Otis Da HousKat]

I'm haven't even taken trigonometry yet, so I'm probably wrong, but I felt like trying since mostly everyone else that posted in here was being useless.-175/625 simplifies to be -7/25. Not sure if that proves it or not. Feel free to correct me if I'm wrong.

Where the hell did you even get 3,4, and 5 from?

[Randomguy]

I just plugged numbers that would work in. Like I said, I have no clue what I'm doing, but thought I would try.

[Maor]

You can't just put a random number when trying to prove equivalence.

Sigh, anyone else?

[Marffy]

holy stuff thats advanced. way different then geometry wich im in =)

[Inv3rted]

holy stuff thats advanced. way different then geometry wich im in =)

Thanks, captain. Stay in school.