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Trigonometry Less Common Trigonometric Functions
Trigonometry
Besides the six most common trigonometric functions, there are also
some less common or littleused trigonometric functions.
Less Common Trigonometric Functions
The list of some less common trigonometric functions:

Versine: Versine is the "versed sine" from one minus the cofunction which
is defined as versin(θ)=vers(θ)=1cos(θ)=2sin2(θ/2).

Vercosine: Vercosine is the "versed cosine" from one minus the cofunction which
is defined as vercos(θ)=1+cos(θ)=2cos2(θ/2).

Coversine: Coversine is the "coversed sine"
from the cofunction of versed sine which is defined as
covers(θ)=versin(π/2θ)=1sin(θ).

Covercosine: Covercosine is the "coversed consine"
from the cofunction of versed cosine which is defined as
coverc(θ)=vercos(π/2θ)=1+sin(θ).

Haversine: Haversine is the "haversed sine" or "halfed versed sine" which is
defined as haversin(θ)=versin(θ)/2=(1cos(θ))/2=sin2(θ/2).

Havercosine: Havercosine is the "haversed cosine" or "halfed versed cosine"
which is defined as havercos(θ)=vercos(θ)/2=(1+cos(θ))/2.

Hacoversine: Hacoversine is the "hacoversed sine" or "halfed coversed sine"
which is defined as hacoversin(θ)=coversin(θ)/2=(1sin(θ))/2.

Hacovercosine: Hacovercosine is the "hacoversed cosine" or "halfed coversed
cosine" which is defined as hacovercos(θ)=covercos(θ)/2=(1+sin(θ))/2.

Exsecant: Exsecant is the "excepted secant" outside the unit circle which is
defined as exsec(θ)=sec(θ)1.

Excosecant: Excosecant is the "excepted cosecant" outside the unit circle which
is defined as excsc(θ)=csc(θ)1.
©sideway
ID: 130700003 Last Updated: 7/2/2013 Revision: 0 Ref:
References
 B. Joseph, 1978, University Mathematics: A Textbook for Students of Science & Engineering
 Ayres, F. JR, Moyer, R.E., 1999, Schaum's Outlines: Trigonometry
 Hopkings, W., 1833, Elements of Trigonometry
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