Fundamental Trig Identities

[WastingBody]

I just don't get this stuff. I've been trying on my own with the book. Also, is there a better way to post this?

Homework Statement

tanx 1 + secx
_________ + _________ = 2csc x
1 + secx tanx
I need to prove that this side equals the other.

Homework Equations

http://users.rcn.com/mwhitney.massed/trigresources/trig-reference.html
^^The reference I was using.

The Attempt at a Solution

tanx(tanx) 1 + secx(1 + secx)
_________ + _________ = 2csc x
1 + secx(tanx) tanx(1 + secx)
tan2 x 1 + 2secx + sec2x
________________ + _________________
1 + secx(tanx) (tanx)1 + secx
tan2x + 1 + 2secx + sec2x
_________________________
1 + cos 1/x(tanx)sec2x + 2cos 1/x + sec2x
_________________________
1 + cos 1/x(tanx)

This is as far as I get before I get lost.

 

[Integral]

First look at https://www.physicsforums.com/showthread.php?t=8997"thread to learn how to use LaTex. With that you can do this:

$$\frac { \tan x } { 1 + \sec x} + \frac {1 + \sec x} {\tan x} = 2 \csc x$$

Now, try multipling the top and bottom of the first term on the left by $$1 - \sec x$$

BTW: Just click on my equations to see what I typed to produce them.

 

[Architeuthis Dux]

Dear student,

I understand that you are struggling with understanding the fundamental trigonometric identities. These identities are crucial in solving various mathematical problems and understanding them is essential for your success in the subject.

Firstly, I would like to suggest that you seek help from your teacher or a tutor who can explain the concepts to you in a more personalized manner. Additionally, there are many online resources and videos available that can help you understand the identities better.

As for the problem you have mentioned, I would like to guide you through the steps to prove that the left side of the equation is equal to the right side.

Starting with the left side:
tanx/tanx + (1+secx)/tanx
= (tanx + 1 + secx)/tanx
= (1/cosx + 1 + 1/cosx)/sinx
= (1 + cosx + 1)/sinx
= (2 + cosx)/sinx
= 2(1/sinx) + cosx/sinx
= 2cscx + cotx
= 2cscx (since cotx = cosx/sinx)

Hence, the left side is equal to 2cscx, which is the same as the right side.

I hope this helps you understand the problem better. Remember to practice more problems and seek help whenever needed. Good luck with your studies.

Best regards,
A scientist