If you are talking about functions in 2-dimensional space, that is, functions of the sort y = f(x), then, by definition, none can be positive in the third quadrant where y is always negative.
If you are talking about functions in 3-dimensional space, ie functions of the kind z = f(x,y), then for the third quadrant in terms of x and y (x<0 and y<0), there are infinitely many functions for which z > 0.
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The coordinates must be as follows: First quadrant: positive, positive Second quadrant: negative, positive Third quadrant: negative, negative Fourth quadrant: positive, negative
y=6x is in the third quadrant while x is negative and in the first quadrant while x is positive.
The third quadrant.
It 2-dimensional coordinate geometry, angles are measured from the origin, relative to the positive direction of the x-axis and they increase in the anti-clockwise direction. As a result, small positive angles are in the first quadrant, and as the angle size increases it moves into the second, third and fourth quadrants.
That's Quadrant - I .