To draw: A unit circle. Use the drawing to complete the chart given that indicates the sign of the trigonometric functions in each quadrant.
Answer to Problem 4CFU
Explanation of Solution
Given information: The chart:
Calculation:
Here is a unit circle. You need to get where you can fill this out on your own from blank.
I suggest you print off some blank ones and practice.
If you remember the special triangles, you should have in geometry.
These are the angles that give you the points marked on the circle in quadrant I and if you add multiples of 90 degrees, the points in all the other quadrants too.
That’s why you see a lot of
Now since
The reciprocal ratios
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Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
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