Defining and understanding trigonometric ratios

Given $\sec\theta=\frac{1}{x}$   on the unit circle,

evaluate:  sec 3π/2

• 0

• undefined

• 1

• -1

• 0

• none of the answer choices

What is the sine of

 $\frac{7\pi}{4}$  

• 1/2

• -1/2

•  $\frac{\sqrt{3}}{2}$  

•  $-\frac{\sqrt{2}}{2}$  

• +

• -

• 0

Using the Table on page 426, what angel has Cosine of .7771?

• 58 Degrees

• 32 Degrees

• 39 Degrees

• 51 Degrees

 $\sin\left(\frac{\pi}{6}\right)=$  

•  $\frac{1}{2}$  

•  $\frac{\sqrt{2}}{2}$  

•  $\frac{\sqrt{3}}{2}$  

• 1

simplify

• sin x

• cos x

• tan x

• csc x

 $\tan\ \frac{3}{2}\pi$   

• 1

• 0

• undefined

• -1

What is the value of cos 90º?

• 0
• 1
• undefined

Which equation is always true?

• sin A = sin B

• cos A = cos B

• cos A = sin B

• sin A = cos B