Patrick B. answered 02/12/19
Math and computer tutor/teacher
In the 4th quadrant
Pythagorean says the hypotenuse is sqrt ( 144+36) = sqrt(180) = 6 * sqrt(5)
sine is -12/6 * sqrt(5) = -2/sqrt(5) = -2*sqrt(5)/5 = (-2/5) * sqrt(5)
cosine is 6/6*sqrt(5) = 1/sqrt(5) = sqrt(5)/5 = (1/5)*sqrt(5)
tangent is -12/6 = -2
cosecant is 5 / (-2 * sqrt(5)) = 5 * sqrt(5) / -10 = sqrt(5)/(-2) = (-1/2)*sqrt(5)
secant is 5/sqrt(5) = 5*sqrt(5)/5 = sqrt(5)
cotangent is -1/2