$\"\"$

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The integral is $\"\"$ .

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Rewrite the integral.

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$\"\"$

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Here $\"\"$ and $\"\"$ .

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The integral represents the difference of the areas of the two curves $\"\"$ and $\"\"$ .

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Graph :

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Graph the function $\"\"$ .

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$\"\"$

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Observe the graph:

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The area of the graph consists of two triangles $\"\"$ and $\"\"$ .

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Area of the $\"\"$ is sum of the areas of two triangles $\"\"$ above $\"\"$ axis and $\"\"$ and below the $\"\"$ axis.

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Area of the triangles $\"\"$ :

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$\"\"$

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Area of the triangles $\"\"$ :

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$\"\"$

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$\"\"$

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$\"\"$

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Graph :

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Graph the function $\"\"$ .

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$\"\"$

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Observe the graph:

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Area of the $\"\"$ is area of the semicircle with radius $\"\"$ units.

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Area of the semicircle $\"\"$ is $\"\"$ .

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$\"\"$ .

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Substitute $\"\"$ and $\"\"$ in equation $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .