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Chapter 5


Right triangle trigonometry

A right triangle is defined as having one angle precisely equal to 90o (a right angle).

Trigonometric identities

H is the Hypotenuse, always being opposite the right angle. Relative to angle x, O is the Opposite and A is the Adjacent.

The Pythagorean theorem

Non-right triangle trigonometry

The Law of Sines (for any triangle)

The Law of Cosines (for any triangle)

Trigonometric equivalencies

Hyperbolic functions

Note: all angles (x) must be expressed in units of radians for these hyperbolic functions. There are 2π radians in a circle (360o).

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