Crossword puzzle clue "precursor of trig"

Here are the possible solutions for precursor of trig clue

Answer
Clue
Relevancy
cosine
Clue
Trig function whose last four letters are another trig function
Definition
a trigonometrical function of an angle
alg
Clue
Precursor of trig.
Trig. prerequisite
Trig's relative
Trig kin
Trig cousin
Kin of trig.
Kin of geom. and trig.

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