1. Verifying/ Proving Identities
show that two items are identical
sin csc = 1
To show LHS = RHS
Usually work with one side only the more complicated side
sec = 1
cos = 1
csc = 1
sin = 1
cot = cos
tan = sin

2. + 1 = sec
Some strategies to Verify:
Work with more complicated side
As needed write everything in terms of
sin , cos , tan , usually
Replace more complicated combos with
simpler expressions
replace with
replace with
replace with
Try to write all terms over same denominator
cos

3. Show that 1 + cot
tan + cot = sec csc
csc - sin = cot cos