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x in (-oo:+oo)
cos(1/2)*x = 0.3 // - 0.3
cos(1/2)*x-0.3 = 0
cos(1/2)*x-0.3 = 0 // + 0.3
cos(1/2)*x = 0.3 // : cos(1/2)
x = 0.3/cos(1/2)
x = 0.3/cos(1/2)
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