**Definitions and Graphs of Trigonometric Functions**

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**Sine Function**

y = sin x, – 1 ≤ sin x ≤ 1.

**Cosine Function**

y = cos x , -1 ≤ cos x ≤ 1.

**Tangent Function**

y = tan x , x ≠(2k + 1), – ∞ ≤ tan x ≤ ∞ .

**Cotangent Function**

Y = cot x , x ≠ k , – ∞ ≤ cot x ≤ ∞.

**Secant Function**

Y = sec x , x ≠ (2k + 1).

**Cosecant Function**

Y = cosec x , x ≠ k .