Question

find all values of x in the interval[0,2pie] that satisfies the equation 2cosx-1=0

Answer 1

we have
\[ 2 \cos x-1=0\]
so
\[\cos x=\frac{1}{2}\]
so
\[x= \pi/3, (2\pi-\pi/3)=>x= \pi/3 , 5\pi/3\]

Answer 2

got it , thank you

Answer 3

welcome :D