(adsbygoogle = window.adsbygoogle || []).push({}); 1. sec^4 x + sec^2 x tan^2 x - 2 tan^4 x = ?

The possible answers are:

a. 4 sec^2 x

b. 3 sec^2 x - 2

c. sec^2 x + 2

d. tan^2 x - 1

2. Relevant equations

No idea.

3. The attempt at a solution

I'm not sure where to begin here. My book first doesn't cover anything above squared, and when it does, the equation is by itself and immediately shows an easy way to convert to simpler terms. I'm confused however on how to convert this equation.

does sec^4 x = 1/cos^4 x?

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Trigonometry identities

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