Question

trig identities

Answer 1

\[secxtanx(1-\sin^2x)=?\]

Answer 2

not sure how to approach this

Answer 3

What is 1-sin^x =?

Answer 4

\[1-\sin^2x=\cos^2x\]

Answer 5

Well, yeah.... I wanted to see if she knew that.

Answer 6

I did haha

Answer 7

OK, so make that substitution, then put everything else in terms of sines and cosines.... I think you'll see it all fall into place! :)

Answer 8

so you have to substitute everything into sine and cosine first in problems like these?

Answer 9

Sorry, @DebbieG . Me, @Ariel.Chun , and @isabel_xxvi are all working on this together. We're all trying to solve the same problem.

Answer 10

Well, it can be a good technique. It kind of depends on the ID, but it's going to work here.

Answer 11

's ok @Dreweed :)

Answer 12

so sec(x) = ?

And tan(x)= ?

Answer 13

sec x is 1/cosx

Answer 14

tan x is sinx/cosx

Answer 15

The main key here is, once you make that first Fundamental ID substitution, it's all just a product of trig functions. So the sines & cosines method is likely to work, because you'll see what can cancel out.

Answer 16

Right... so what do you end up with after canceling where possible?

Answer 17

sin x

Answer 18

Excellent. :)

Answer 19

yay!