Precalculus Trig Identities

Select the correct solution

• csc² x

• cot² x

• sin² x

• sec² x

Write the following expression as the sine, cosine, or tangent of an angle.
cos 175⁰ cos 55⁰ + sin 175⁰ sin 55⁰

• sin(120)

• cos(120)

• cos(230)

• sin(230)

Tags

CCSS.HSF.TF.C.9

Select the correct solution

cos ² x + sin ² x=

^{(It's on your reference sheet!!)}

• 1

• csc ² x + sec ² x

• sin ² x

• 1 - sin ² x

Solve the following for cos²θ:
sin²θ + cos²θ = 1

• cos²θ = 1 - sin²θ

• cosθ = 1 + sin²θ

• cosθ = 1 - sinθ

• cos²θ = Adj/hyp

• I only

• III only

• I and II only

• II and III only

Which of the following would be a step to prove the following identity?

• (1/ sin x) - (1 / cos x)

• (cos x - sin x) / ( sin x)

• (cos x - sin x) / (cos x)

• (1/ sin x cos x)

• (cos/sin)(sin/cos)

• cos

• sin

• (sin/cos)(cos/sin)

• 
• 
• 
• 

What is a step to verifying this identity?

• (cosx/sinx)(sinx/cosx)

• cosx

• sinx

• (1/tanx)(1/cotx)

• A

• B

• C

• D

Tags

CCSS.HSF.TF.C.9