Verified Answer :

blaze4

Only For x=pi. Cos(pi)=-1

From the given interval, 0 ≤ x ≤ 2π. the value of \(x=\pi\) that gives cos(x)=-1

Given :

\(cos(x)=-1\), interval is 0 ≤ x ≤ 2π

lets check the angle where cos is -1

we know that cos(180) is -1

So we can write \(cos(\pi )=-1\)

Now we write the general solution for cos(x)=-1

\(x=\pi +2\pi n\)

We look at the given interval that is 0 ≤ x ≤ 2π

So, the solution for x is \(\pi\)

Hence , \(x=\pi\) given cos(x)=-1

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