Trigonometric Identities

• 1

• csc x

• sin x

• cot x

• sec x

• cos x

• sin x

• tan x

• csc x

• 1

• True 

• False 

Simplify the trig expression.

• 1
• -1
• cotx
• cosx

To verify, which side seems the most complex. (a)  

• Left
• Right

What could be our first strategy to simplify the left side? (a)  

• Rewrite into sines and cosines
• Combine fractions
• factor common factor
• multiply by the conjugate

What could be our first strategy to simplify the right side? (a)  

• Rewrite into sines and cosines
• Combine fractions
• factor common factor
• multiply by the conjugate
• Use a Pythagorean Identity