Question

cos²β(1+tan²β)=1. Have to show this is an identity.

Answer 1

1+tan^2 = sec^2 for starters :)

and sec^2 = 1/cos^2

cos^2
----- = 1
cos^2

Answer 2

or you could just distribute it thru and get:

cos^2 + sin^2 = 1

Answer 3

you make it look so easy

Answer 4

lol..... i blam ethe guys who invented it ;)