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2cos(x) = sin(5π/2 - x)
2cos(x) = cos(x) --> cos(x) = 0; cos(x) = ±1/√2 --> x = π/2 + πk; x = π/4 + πk/2, k - целое.
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2cos(x) = sin(5π/2 - x)
2cos(x) = cos(x) --> cos(x) = 0; cos(x) = ±1/√2 --> x = π/2 + πk; x = π/4 + πk/2, k - целое.