How do you find the 6 trigonometric functions for 600 degrees?

2 Answers
Sep 23, 2015

sin(600^"o") = -sqrt(3)/2
cos(600^"o") = -1/2
sec(600^"o") = -2
csc(600^"o") = -(2sqrt(3))/3
tan(600^"o") = sqrt3
cot(600^"o") = sqrt(3)/3

Explanation:

First thing, let's see how many full loops we can get out of that angle, theta = 600^"o" = 360^"o" + 240^"o" = 2*360^"o" - 120^"o"

Why this is important, you may ask? It's because every 360^"o" degrees we have a full loop and return to where we were. So for the two main trig functions, sin(x) and cos(x) we can say that

sin(600^"o") = sin(240^"o") = sin(-120^"o")
cos(600^"o") = cos(240^"o") = cos(-120^"o")

And since every other function is a ratio of one or two of these functions, we can work with that. Now, we know that
sin(-theta) = -sin(theta) and cos(-theta) = cos(theta)

So we can say that
sin(600^"o") = -sin(120^"o")
cos(600^"o") = cos(120^"o")

We can then use the angle sum / double angle formula, since 120^"o" = 60^"o"+60^"o"
-sin(120^"o") = -(sin(60^"o")cos(60^"o") + sin(60^"o")cos(60^"o"))
cos(120^"o") = cos(60^"o")cos(60^"o") - sin(60^"o")sin(60^"o"))

Since 60^"o" is a special angle we know that sin(60^"o") = sqrt(3)/2 and cos(60^"o") = 1/2, so

-sin(120^"o") = -(sqrt(3)/2*1/2 + sqrt(3)/2*1/2) = -sqrt(3)/2
cos(120^"o") = 1/2*1/2- sqrt(3)/2*sqrt(3)/2 = -2/4 = -1/2

And from that, we just evaluate the others by division:
sec(600^"o") = 1/cos(600^"o") = -1/(1/2) =-2
csc(600^"o") = 1/sin(600^"o") = -1/(sqrt(3)/2) = -2/sqrt(3) = -(2sqrt(3))/3
tan(600^"o") = sin(600^"o")/cos(600^"o") = (sqrt(3)/2)/(1/2) = sqrt3
cot(600^"o") = 1/tan(600^"o") = 1/(sqrt(3)) = sqrt(3)/3

Sep 23, 2015

Find the 6 trig functions of 600 deg

Explanation:

600 = 240 + 360 deg
sin 600 = sin 240 = - sin 60 = - sqrt3/2
cos 600 = cos 240 = - cos 60 = - 1/2
tan 600 = tan 240 = (-sqrt3/2)/-(1/2) = sqrt3 (arc 240 is in Quadrant III, its tan is positive)
cot 600 = 1/(tan) = 1/sqrt3 = sqrt3/3
sec 600 = 1/(cos) = - 2
csc 600 = 1/(sin) = - (2sqrt3)/3