Simplify and Evaluate Using Identities

 $\sin^2x+\cos^2x=$  

•  $1$  

•  $-1$  

•  $\tan^2x$  

•  $\cot^2x$  

Simplify  $\sin x\sec x$  

•  $\csc x$  

•  $\tan x$  

•  $\cot x$  

•  $\cos x$  

Simplify  $\cos^2x\left(\sec^2x-1\right)$  

•  $\sin^2x$  

•  $\cos^2x$  

•  $\tan^2x$  

•  $\csc^2x$  

• sin²θ
• cosθ
• tanθ
• 1- sin²θ

• csc²θ
• sec²θ
• cscθ
• 1

• secθ
• cos²θ
• sin²θ
• sin²θ/cos²θ

• 1/cos x
• 1
• cot x
• -1

Simplify (Hint: you will need to FOIL first)

• sinθ

• cot²θ

• tan²θ

• cos²θ

Which of the following is not a pythagorean identity?

• cot²x + 1 = csc²x

• csc²x + 1 = cot²x

• cot²x - csc²x = -1

• csc²x - cot²x = 1

Simplify sin²(x) - cos(x)sec(x)

• sec²(x)

• cos²(x)

• -cos²(x)

• -sec²(x)