locating roots A level maths

hi,
i can't seem to get the same answer as the solution. I have also used radians when substituting but I just can't get the same answer

Are you squaring the number inside the cos() when you put it in your calculator?

Are you squaring the number inside the cos() when you put it in your calculator?

lol, I understand now.
I was squaring the whole cos x not the x 😭

but thankssss

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