$\"\"$

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The expression is $\"\"$ .

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The value are $\"\"$ , $\"\"$ and $\"\"$ .

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Find the value of the expression.

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$\"\"$ (Original expression) \ \

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$\"\"$ (Substitute $\"\"$ and $\"\"$ ) \ \

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$\"\"$ (Simplify)

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$\"\"$ (Substitute $\"\"$ and $\"\"$ )

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Therefore the value of $\"\"$ is $\"\"$ .

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$\"\"$

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The value of $\"\"$ is $\"\"$ .