Added sec() function

[titoausten]

• sec() is a trigonometry function that returns the reciprocal (not inverse) of cos() i.e sec() = 1 / cos().

• Added new regression tests for sec().

[jrgemignani]

@titoausten Can you justify needing this?

[titoausten]

@jrgemignani I believe it's better to have a stand alone function than finding reciprocal of the age_cos function. AGE can be used for mathematical graph queries too and having such functions would make AGE's use easy.

[jrgemignani]

@titoausten Does Neo4j or PostgreSQL support what you want to add?

[titoausten]

@titoausten Does Neo4j or PostgreSQL support what you want to add?

Yes, the sec() function is dependent on PostgreSQL's dcos() function in float.c file.

[jrgemignani]

@titoausten Does Neo4j or PostgreSQL support what you want to add?

Yes, the sec() function is dependent on PostgreSQL's dcos() function in float.c file.

Let me rephrase that,... does Neo4j or PostgreSQL have a secant function?

[titoausten]

@titoausten Does Neo4j or PostgreSQL support what you want to add?

Yes, the sec() function is dependent on PostgreSQL's dcos() function in float.c file.

Let me rephrase that,... does Neo4j or PostgreSQL have a secant function?

Oh, none of them have a secant function and that's why I worked on it.