Trigonometry

• sqrt(3)/3

• -sqrt(3)/3

• sqrt(3)

• -sqrt(3)

 $\sin\ D\ =\ \frac{-15}{25}$  

If D lies in Quadrant 4, then determine cos D

(a)  

What is the exact value of $\sec\left(-\frac{\pi}{4}\right)$  ?

•  $-\frac{\sqrt{2}}{2}$  

•  $\frac{\sqrt{2}}{2}$  

•  $\sqrt{2}$  

•  $\frac{1}{2}$  

√3
̅ ̅ ̅2̅ ̅ ̅

• cos π/6
• sin π/6
• cos π/3
• tan π/3

Use the unit circle to evaluate

cos 4π/3

• -√3/2

• √3/2

• 1/2

• -1/2

∆XYZ and ∆GHI are similar right triangles with the right angles being at Y and H. If the sine of ∠X is 3/5, what is the cosine of ∠I?

• 4/5
• 5/3
• 3/5
• 5/4

What is cos 90°?

(a)  

In right triangle DEF with right angle D.  If
Tan E = 5/12, what is Tan F?

• 12/5
• 5/12
• 12/13
• 13/12