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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

Find all solutions to the equationin the interval 0 21 Enter thesolutions in increasing ordercos 2x COS XTTT ㅠX22Remember cos 20 cos20 sin20 class=

Respuesta :

We have the equation

[tex]\cos 2x=\cos x[/tex]

but this implies that

[tex]2x=x[/tex]

and this only occurs when

[tex]x=0[/tex]

then, the answer is x=0.

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