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Draw the graph of `y = cos^(2)x.`

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Draw the graph of `y = cos^(2)x.`
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Draw the graph of `y = f(x) = cos^(2) x`
Period of the function is `pi`.
`cos^(2) x ge 0, AA x in R`.
Therefore, the graph lies above the x - axis.
Also function is differentiable.
Hence the graph of the function is as shown in the following figure.
image
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