On the unit circle, the coordinates of a point are (x, y) = (cos θ, sin θ). Find the value of y if θ = 30°.

If θ lies in quadrant II, the signs of (sinθ, cosθ) are respectively:

Find the fundamental periods of cos(2πx) and sin(2πx), respectively.

The value of sin(75°) is equal to ________.

If tan(A) = 13 and tan(B) = 12, find the value of tan(A + 2B).