Math Help - Maths help

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

please show anyworking. :P

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

please show anyworking. :P
Hi and welcome to MHF. Please post one question per thread.

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

Divide by 2 and take the square root of both sides to simplify. What do you get and any ideas on how to solve?