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Trigonometric Functions

The Right Triangle

Label the sides of the following right triangles-

[pic]

Sine = Cosine = Tangent =

So….. what is the famous saying to remember this???

| |

Let’s look at each quadrant and the signs of each trigonometric function.

| | | | |

|[pic] |[pic] |[pic] |[pic] |

|Quadrant I |Quadrant II |Quadrant III |Quadrant IV |

|Sin ( is |Sin ( is |Sin ( is |Sin ( is |

|Cos ( is |Cos ( is |Cos ( is |Cos ( is |

|Tan ( is |Tan ( is |Tan ( is |Tan( is |

Examples:

In questions 1 -3 you are given the coordinates of point P, m 0 and cos ( ................
................

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