For each part, verify that the identity is correct by calculating the values of the left and

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For each part, verify that the identity is correct by calculating the values of the left and right sides of the equation, substituting .

12. Define two variables: alpha = 5π/9, beta = π/7. Using these variables, show that the following trigonometric identity is correct by calculating the value of the left- and right-hand sides of the equation.

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