Question

simplify sec^2x-tan x-3

Answer 1

use the identity sec^x = 1 + tan^2 x

Answer 2

plug in this value for sec^2 x then simplify

Answer 3

is that the answer?

Answer 4

do you follow that?

Answer 5

so put in sec^x =1+tan ^2x then put in sec^2x

Answer 6

@tdh2014 : The expression you've started with, sec^2x-tan x-3, mixes two trig functions. cwrw238's suggestion is right on target; by using the identity he gave you, you can write this sec^2x-tan x-3 as an expression involving only one function, tan x.

What do you have now? Rewrite sec^2x-tan x-3 as indicated.

Answer 7

tan^2x-tanx-2 is the answer i got

Answer 8

that looks good!
Now for a little review: Can you simplify (factor) x^2 - x - 2?
If so, write your factors here.