arccosine sec inverse cotangent arcsec mathematical function arc sine inverse cosine cotan cotangent map cosine circular function inverse cosecant arc cosine arc tangent single-valued function cosecant sine arctangent arcsecant arccos arccotangent arctan inverse tangent cosec function arccosecant sin tangent inverse sine secant arc secant cos inverse secant mapping arcsin tan arcsine arc cosecant arc cotangent

multinomial mathematical function transformation polynomial operator exponential function inverse function metric map expansion mathematical relation circular function single-valued function metric function trigonometric function isometry exponential threshold function mapping Kronecker delta

usefulness functional role use raison d'etre nonfunctional purpose utility

stead capacity lieu portfolio role place duty part office position second fiddle hat

serve service cut run roll go double operate work

answer act as suffice prelude service do serve

serve officiate

procedure programme computer program utility routine contingency procedure routine computer programme program reusable routine subroutine supervisory routine software system package software executive routine computer software subprogram service routine cataloged procedure library routine software package random number generator software program tracing routine recursive routine

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