$\"\"$

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a.

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The expression is $\"\"$ .

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Common out $\"\"$ from the expression.

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$\"\"$ .

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Factor form of the expression is $\"\"$ .

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$\"\"$

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b.

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The trigonometric expression is $\"\"$ .

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Common out $\"\"$ from the expression.

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$\"\"$ .

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Factor form of the expression is $\"\"$ .

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$\"\"$

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a. Factor form of the expression is $\"\"$ .

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b. Factor form of the expression is $\"\"$ .