SOLUTION: Express the given trigonometric function in terms of the same function of a positive angle. cos190*, tan 290*

SOLUTION: Express the given trigonometric function in terms of the same function of a positive angle. cos190, tan 290

Question 1052983: Express the given trigonometric function in terms of the same function of a positive angle.
cos190*, tan 290*
Answer by Edwin McCravy(20060) (Show Source): You can put this solution on YOUR website!

This problem requires:
1. Knowing how to find the reference angle of any angle.
2. Knowing what the signs of the trig ratios are in
the various quadrants.

190� is in QIII, its reference angle is 190�-180� = 10�
The cosine is negative in QIII, the cosine of 10� in positive.
So cos(190�) = -cos(10�)

290� is in QIV, its reference angle is 360�-290� = 70�
The cosine is positive in QIV, the cosine of 70� in positive.
So cos(290�) = cos(70�)

Edwin

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