Question 824301
490 - 360 = 130.  130 is 50 degrees from 180 (180-130=50).  Thus the reference angle is 50 degrees in the second quadrant.  So tan is negative.<P>
But the question asks for an angle less than 45.  Use the cofunction identity tan(90-x) = cot(x).  50 = 90-40.  Remember, it has to be negative, because it's in the second quadrant.<P>
tan(490) = - tan(90-40) = -cot(40)