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COS(x)
Funkcia COS vracia kosínus @x, kde @x je v radiánoch.
Táto funkcia je kompatibilná s Excelom.
COS(0.5) sa rovná 0.877583.
COS(1) sa rovná 0.540302.
COSH, SIN, SINH, TAN, TANH, RADIANS, DEGREES.
