Defining and understanding trigonometric ratios

In complementary angles of right triangles, the sine of one is the ________ of the other.

• Sine
• Cosine
• Tangent
• None

cos  $\frac{\pi}{6}$  

•  $\frac{\sqrt{3}}{2}$  

•  $-\frac{\sqrt{2}}{2}$  

•  $-\frac{1}{2}$  

•  $\frac{\sqrt{3}}{3}$  

What is the value of cosine at 135

• 0
• 1/2
• √2 /2
• -√2 /2

What is the pythagorean identity equation?

•  $\sin^2\theta-\cos^2\theta=1$  

•  $\sin^{ }\theta+\cos^{ }\theta=1$  

•  $\sin^2\theta+\cos^2\theta=1$  

•   $\sin^2\theta-\cos^2\theta=\tan^2\theta$  

cos(300)

cscθ=

• 1/cosθ
• 1/sinθ
• 1/tanθ
• 1/secθ

• 1

• 0