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What are the 3 basic Trigonometric Formulas?
I. Sine (sin) [read as sign]
II. Cosine (cos) [read as cosign]
III. Tangent (tan) [read as it written]

Side c: Hypotenuse
Always the opposite of the right angle.
Sin, Cos, and Tan are used depending on the angles and measurements given.
Sin = Opposite Side (of referenced angle) / Hypotenuse
Cos = Adjacent Side (of referenced angle) / Hypotenuse
Tan = Opposite Side / Adjacent Side

How to remember these functions ?
S O H  C A H  T O A
The initial letter of each set represents the functions, O represents Opposite, A represents Adjacent, and H represents Hypotenuse.

The other three functions are:
 I. Cotangent (cot)
 II. Secent (sec)
 III. Cosecent (csc)

It turns out that the three functions referenced in the last card are the repirocals of the first three functions that were introduced.

