Algebra 2; Trigonometric Formulas
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What are the 3 basic Trigonometric Formulas?
I. Sine (sin) [read as sign]
II. Cosine (cos) [read as co-sign]
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.
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