# How would I solve cos x * cos 2x=0 ?

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To solve cos(x) * cos(2x) = 0, you need to find the values of x that make the product equal to zero. This occurs when either cos(x) = 0 or cos(2x) = 0. For cos(x) = 0, the solutions are x = π/2 + πn and x = 3π/2 + πn, where n is an integer. For cos(2x) = 0, the solutions are 2x = π/2 + πn or 2x = 3π/2 + πn, where n is an integer. Solving for x, you get x = π/4 + πn or x = 3π/4 + πn, where n is an integer.

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