1. ## Simplifying trig identities

I have to do some problems in my textbook and these ones are throwing me off:

1. tan^4x + 2tan^2x +1

I would first factor out tan but the 2tan^2x is confusing me.

2. 1 - 2cos^2x + cos^4x

Same with this one, I've never seen a multiplier in these types of identities.

2. Originally Posted by clay10
I have to do some problems in my textbook and these ones are throwing me off:

1. tan^4x + 2tan^2x +1

this expression is a perfect square ... factor it.

2. 1 - 2cos^2x + cos^4x

same thing here
...