Consider the f$($x$)=$ Acos$($x$)$ function shown in the figure in blue color. What is the value of amplitude A for this function?

Consider the $f(x)=$Acos$(x)$ function shown in the fiqure in blue color. What is the value of amplitude A for this function?

As a reference the $g(x)=cos(x)$ function is shown in red color, and green tick marks are drawn at integer multiples of $n.$

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