What are the sine, cosine, and tangent of Θ = 3 pi over 4 radians?

Our angle teta is:

teta = 3pi/4

since that is larger than pi/2 but less than pi that means that our angle lies in II quadrant (x negative y positive)

sin (3pi/4) = √2/2

cosine and tangent of that angle must be negative because of position of the angle.

cos (3pi/4) = - √2/2

tan (3pi/4) = - 1