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Popular >

cos(4x)cos(x-1)=0

Solution

cos (4 x) cos (x - 1) = 0

Solution

x = \frac{π}{8} + \frac{πn}{2}, x = \frac{3 π}{8} + \frac{πn}{2}, x = \frac{π}{2} + 2 πn + 1, x = \frac{3 π}{2} + 2 πn + 1

+1

Solution steps

cos (4 x) cos (x - 1) = 0

Solving each part separately

cos (4 x) = 0 or cos (x - 1) = 0

cos (4 x) = 0 : x = \frac{π}{8} + \frac{πn}{2}, x = \frac{3 π}{8} + \frac{πn}{2}

cos (x - 1) = 0 : x = \frac{π}{2} + 2 πn + 1, x = \frac{3 π}{2} + 2 πn + 1

Combine all the solutions

x = \frac{π}{8} + \frac{πn}{2}, x = \frac{3 π}{8} + \frac{πn}{2}, x = \frac{π}{2} + 2 πn + 1, x = \frac{3 π}{2} + 2 πn + 1

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