If tan θ < 0 and sin θ < 0, in which quadrant does θ lie?

• II

• III

• IV

• II or IV

• I and II only

• I and III only

• II and III only

• I, II and III

If tan θ cos θ > 0, in which quadrant does θ lie?

• I or II

• I or III

• I or IV

• II or IV

If tan θ = k and 90° < θ < 180°, then sin θ =

• tan θ

• -tan θ

• 1

• -1

• 1

• cos θ

• cos²θ

• sin²θ

• 1.

Which of the following may represent the graph of y = cos x for 90° ≤ x ≤ 270°?

• 
• 
• 
• 

The figure shows the graph of a periodic function y = f(x).

Find the amplitude of y = f(x).

• 1

• 0.5

• 0

• -0.5

The figure shows the graph of a periodic function y = f(x).

Find the period of y = f(x).

• 90°

• 180°

• 270°

• 360°