Useful trig formulas and some very helpful links for learning trigonometric concepts.
Triangle ABC is any triangle with side lengths a,b,c
Reciprocal identities Pythagorean Identities Quotient Identities CoFunction Identities EvenOdd Identities SumDifference Formulas Double Angle Formulas PowerReducing/Half Angle Formulas SumtoProduct Formulas ProducttoSum Formulas In mathematics, the trigonometric functions (also called circular functions) are functions of an angle. They are used to relate the angles of a triangle to the lengths of the sides of a triangle. Trigonometric functions are important in the study of triangles and modeling periodic phenomena, among many other applications.

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