#5 Trig Identities & Formulas

Simplify: (secx-1)(secx+1)

• tan²x

• sinx

• cot²x

• cosx

Simplify:  tanxcotx-cos²x

• tanx
• cotx
• sin²x
• cos²x

Which of the following is not a pythagorean identity?

• cot²x + 1 = csc²x

• csc²x + 1 = cot²x

• cot²x - csc²x = -1

• csc²x - cot²x = 1

Tags

CCSS.HSF.TF.C.8

cos²x =

• 1 - sec²x

• 1 - sin²x

• sin²x

• 1

Tags

CCSS.HSF.TF.C.8

Simplify:  tanxcotx-cos²x

• tanx
• cotx
• sin²x
• cos²x

Simplify this to a basic trigonometry function:
tan(x)csc(x) 

• tanx
• secx
• cotx
• cscx

What is the reciprocal function of sec(x)?

• cos(x)

• sin(x)

• csc(x)

• cot(x)

Tags

CCSS.HSF.TF.A.2

Which of the following is NOT a pythagorean identity?

• sin²x + cos²x = 1

• 1 - cos²x = sin²x

• 1 - sin²x = cos² x

• sin²x - cos²x = -1

Tags

CCSS.HSF.TF.C.8

Which of the following is NOT a pythagorean identity?

• 1 + tan²x = sec²x

• sec²x - 1= tan²x

• tan²x - sec²x = -1

• tan²x - 1 = -sec²x

Tags

CCSS.HSF.TF.C.8

 $\frac{1-\cos^2\theta}{\cos^2\theta}$  can be written in a single trigonometric identity as: 

•  $\cos^2\theta$  

•  $\sin^2\theta$  

•  $\sec^2\theta$  

•  $\tan^2\theta$