At which point will f(x) attain a maxima where, \(\mbox{f}(x)=\left\{(sin(\frac{\pi x}{2}), & \mbox{$x \gt 1$} \\3 – 2x, & \mbox{$x \geq 1$}

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At which point will f(x) attain a maxima where, \(\mbox{f}(x)=\left\{<br />(sin(\frac{\pi x}{2}), & \mbox{$x \gt 1$} \\<br />3 – 2x, & \mbox{$x \geq 1$}