Step 1:

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$\"\"$

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Observe the graph, it is a cosine function graph.

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General form of cosine function $\"\"$

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The maximum value is $\"\"$ occurs at $\"\"$ .

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Amplitude of the graph is $\"\"$ .

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Period is $\"\"$

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$\"\"$

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$\"\"$

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Substituteh values of $\"\"$ in $\"\"$ .

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$\"\"$

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Solution:

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$\"\"$