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COSH(x)
COSH function returns the hyperbolic cosine of @x, which is defined mathematically as (exp(@x) + exp(-@x)) / 2. @x is in radians.
This function is Excel compatible.
COSH(0.5) equals 1.127626.
COSH(1) equals 1.543081.
COS, SIN, SINH, TAN, TANH, RADIANS, DEGREES, EXP.
