Trigonometry simplification


Question:

Trigonometry Simplification

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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Mathematics: Trigonometry simplification
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