Question

Find all solutions to the equationin the interval [0, 21). Enter thesolutions in increasing order.cos 2x = COS XTTT ㅠX=[?]22Remember: cos 20 = cos20 – sin20

Answer 1

We have the equation

`\cos 2x=\cos x`

but this implies that

`2x=x`

and this only occurs when

`x=0`

then, the answer is x=0.