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Math : Trigonometry
Contents for Trigonometry Module 1 : Trigonometric Functions
The trigonometric functions of angles are the ratios of the various sides of a triangle. Consider a right-angled triangle ABC as shown in the figure below.
The following terminology is useful.
For angle A (sometimes referred to as angle CAB), the following fundamental trigonometric functions can be defined.
From the definitions, it can be seen that tan A = sin A / cos A.
A few more useful functions can be defined.
From the definitions, it can be seen that cot A = cosec A / sec A