Answer
maximum $1.76$,
minimum $-1.76$
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Work Step by Step
See graph of the function, the maximum can be found as $1.76$ at $x=2n\pi +0.635,n=0,\pm1,\pm2...$,
and the minimum can be found as $-1.76$ at $x=2n\pi +2.507,n=0,\pm1,\pm2...$.
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