Determine the signs of the trigonometric functions of an angle in standard position with the given...

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Determine the signs of the trigonometric functions of an angle in standard position with the given...

Determine the signs of the trigonometric functions of an angle in standard position with the given measure. See Example 6 .

-640°

math precalculus

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Answer 1

Answer #1

Solution:

Note:

1. If lies in the first Quadrant, all the trigonometric ratios are positive.

2. if lies in the second Quadrant, sinand consequently cosecare positive and other trigonometric ratios are negative.

3. if lies in the third Quadrant, tanand consequently.cotare positive and the others are negative.

4. If lies in the fourth quadrant, cosand consequently secare positive and the others are negative.

.

is in I Quadrant, with x,y and r all positive.

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Answer 2

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