Question 874516
what is the solution of the equation 2cos^2X=1 on the interval [0, 360 degrees]
{{{2cos^2(x)=1}}}
{{{cos^2(x)=1/2}}}
cos(x)=ą&#8730;(1/2)=ą&#8730;2/2
x=45&#730;, 135&#730;, 225&#730;, 315&#730;