Express the trigonometric function in terms of its positive acute reference angle. cos298° = cos

298 * falls in quadrant 4 is 0 * is the positive x-axis. In quadrant 4, cos is positive. Therefore, we simply need to calculate the acute angle, x, that correlates to 298*.

360 = 298 + x

62 = x

Therefore, we have:

cos (298*) = cos (62)

In case you need to know:

sin (298*) = - sin (62)

tan (298*) = - tan (62)

Since both sin and tan are negative in the fourth quadrant.