CalcCos

CalcCos

CalcCos[ x ] calculates the cosine of a number as a decimal number.

Usages

CalcCos[ x ]

CalcCos[ x ] calculates the cosine of x radians as a decimal number. x must be a decimal number such as 0.5; whole numbers and exact values such as Pi are not calculated (see the warning below).

Example in out
A decimal number of radians. CalcCos[ 0.5 ] 0.87758256189
Each element of a list. CalcCos[ {0.5, 1.5} ] {0.87758256189, 0.070737201668}

CalcCos[ x, Variant=>'deg' ] or CalcCos[ Quantity[x, 'deg'] ]

With the option Variant=>'deg', or with an angle in degrees, x is in degrees. Whole numbers are calculated too.

Example in out
An angle in degrees. CalcCos[ 60, Variant=>'deg' ] 0.5
A quantity in degrees. CalcCos[ Quantity[60, 'deg'] ] 0.5
Options

Variant

'deg' for an angle in degrees. Default: radians.

Syntax Example out
CalcCos[ x, Variant=>'deg' ] CalcCos[ 60, Variant=>'deg' ] 0.5
Details
  • Rounding errors are removed: CalcCos[ Quantity[90, 'deg'] ] is displayed as 00.
  • Variables: CalcCos[ x ] with a variable x is left unevaluated.
Warning

In radians, CalcCos only calculates decimal numbers with a fractional part. CalcCos[ 1 ], CalcCos[ 1.0 ] (which counts as the whole number 1) and CalcCos[ Pi ] are left unevaluated. Use Numerical to calculate them: Numerical[ CalcCos[1] ]. For exact values, such as the cosine of Pi, use the function itself with Simplify.

See also: Numerical, Math functions, Quantity