1. [SOLVED] Trigonometric Identities Help!!!

Hi, stuck on his question for about 15min and counting. I dont understand how they got the answer

Simplify.

1) 1 - Cos^2x

2) 1 - Sin^2x

-Thanks

2. Originally Posted by MP3
Hi, stuck on his question for about 15min and counting. I dont understand how they got the answer

Simplify.

1) 1 - Cos^2x

2) 1 - Sin^2x

-Thanks
Use the well-known identity $\cos^2x+\sin^2x=1$
That's all

3. Ohhh thank you, thank you very much