##### Trignometric Functions – Notes

**Trigonometric Functions**

Quadrilateral Angles: Angles that are integral multiples of are called quadrilateral angles.

Some identities:

- Cos
^{2}q + sin^{2}q = 1 - Sec
^{2 }q = 1 + tan^{2}q - Cosec
^{2 }q = 1 + cot^{2}q

Sin (2n + q) = sin q, where n is any integer.

Cos (2 n + q) = cos q, where n is any integer.

Sin q = 0 q = n , where n is any integer.

Cos q = 0 Þ q = (2n + 1) , where n is any integer

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Class 11th Maths 3 - Trignometric Functions - Notes

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