trigonometric functions

• trigonometric functions are defined using a right-angled triangle.
• they relate an angle of a right-angled triangle to the ratio of two side lengths.
• the most familiar trigonometric functions are cosine, sine and tangent.
• their reciprocals are respectively secant, cosecant and cotangent.

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Introduction to Trigonometry from Math is Fun

Trigonometry functions - introduction from Math Open Reference

Trigonometric Functions Calculator from CalculatorSoup