In quadrant I, x, y, and r are all positive, so that all six trigonometric functions have
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In quadrant I, x, y, and r are all positive, so that all six trigonometric functions have positive values. In quadrant II, x is negative and y is positive (r is always positive). Thus, in quadrant II, sine is positive, cosine is negative, and so on. For Exercises, complete the following table of values for the signs of the trigonometric functions.
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