1. ## Maths help

Hello

stuck on a few questions

2 cos squared x = 1/2

3 cos 2x + cos x +1 = 0

2 cos 2x - sinx = 0

thanks in advance for any help

2. Originally Posted by Wallothet
Hello

stuck on a few questions

2 cos squared x = 1/2

3 cos 2x + cos x +1 = 0

2 cos 2x - sinx = 0

thanks in advance for any help

I'll start with #1. $2\cos^2(x)=\frac{1}{2}$