Unit 4 - Objective 3 - Values of Trigonometric Functions
Signs of trigonometric functions in all four Quadrants.
Reference Angles are always next to the x-axis
Given the reference angle , you can find the angle in the appropriate quadrant and given angle , you can find its reference angle.
The unit circle can be used to find trigonometric function for angles dividing the quadrants.
|On the unit circle||x^2 + y^2 = 1 and||x = cos|
|y = sin|
sin 90° = y = 1
cot 90° = 1/tan 90° = x/y = 0/1 = 0
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