$\"\"$

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The equation is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ (Multiply each side by 2) \ \

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$\"\"$

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$\"\"$ (Apply distributive property)

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(Apply double angle formula: $\"\"$ )

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$\"\"$ $\"\"$

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$\"\"$

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(Subtract $\"\"$ from each side)

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$\"\"$

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$\"\"$

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(Subtract $\"\"$ from each side)

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$\"\"$

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$\"\"$

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$\"\"$ (Take out common factors) \ \ $\"\"$

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$\"\"$

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$\"\"$ (Apply zero product property) \ \

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$\"\"$

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$\"\"$

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$\"\"$

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The values are $\"\"$ $\"\"$

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The solutions are $\"\"$ .