Which equation represents the unit circle centered at the origin?

Convert 150° to radians.

Is the point (−1/2, √3/2) on the unit circle?

Find a coterminal angle between 0 and 2π for θ = −13π/4, then evaluate sin(θ).

Determine tan(−17π/6) by finding a coterminal angle in [0, 2π) and simplifying.