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Assuming "trigonometric functions" is a general topic | Use as referring to a mathematical definition or a class of mathematical terms or a class of mathematical identities instead
Mathematics
Trigonometry

Trigonometric Calculations

compute values of trigonometric functions
compute values of inverse trigonometric functions

Trigonometric Functions

compute properties of a trigonometric function
compute properties of an inverse trigonometric function
plot a trigonometric function
analyze a trigonometric function of a complex variable
analyze a trigonometric polynomial
generate a table of special values of a function
compute the root mean square of a periodic function

Trigonometric Identities

find multiple-angle formulas
find addition formulas
find other trig identities

Trigonometric Equations

solve a trigonometric equation

Trigonometric Theorems

apply a trigonometric theorem

Spherical Trigonometry

apply a theorem of spherical trigonometry
compute the period of a periodic function
 
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