# Algebra 2; Trigonometric Formulas

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 Author: Paynefan ID: 64022 Filename: Algebra 2; Trigonometric Formulas Updated: 2011-02-04 20:28:12 Tags: trig formulas algebra trigonometric Folders: Description: Quick Notes on the 6 different types of Trigonometric Formulas, and a few rules about them. Show Answers:

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1. 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]

2. 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
3. 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.
4. The other three functions are:
• I. Cotangent (cot)
• II. Secent (sec)
• III. Cosecent (csc)
5. It turns out that the three functions referenced in the last card are the repirocals of the first three functions that were introduced.
• Cot =_____1_____
• Tangent

• Sec =_____1_____
• Cosine

• Csc =_____1_____
• Sine

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