Question

cos2(theta) = 1/2, Solve for theta?

Answer 1

\[\cos(2\Theta) = 2\cos^{2}\Theta -1\]

so \[2\cos^{2}\Theta -1 = \frac{ 1 }{ 2 }\]

can you solve it now?

Answer 2

Add 1, divide by 2, then take the square root? Then we take inverse cos?

Answer 3

\[\frac{ \sqrt{3} }{ 2 }\]
When you solve at the end you get pi/6

Answer 4

Think that's right thank you!

Answer 5

Take the positive and negative roots so there are 3 more solutions.

Answer 6

Thank you! I got it!

Answer 7

niceee yw =))