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
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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. $\displaystyle 2\cos^2(x)=\frac{1}{2}$ Divide by 2 and take the square root of both sides to simplify. What do you get and any ideas on how to solve?
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