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Trigonometry Simplification

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Use an addition of subtraction formula to simplify the equation. Then find all solutions in the interval [0, 2*pie).
a) cos(x)*cos(lambda)(x) + sin(x)*sin(2x) = 1/2
b) sin(3x)*cos(x) - cos(3x)*sin(x) = 0.

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Solution Summary

The solution uses an addition of subtraction formula to simplify the equation.

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