I'd greatly appreciate is somebody proved the following true.

1. 1-sinx/1+sinx = (secx-tanx)^2

2. sinx+1/cosx+cotx = tanx

3. sin^2x-tan^2x/1-sec^2x = sin^2x

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- Jul 13th 2007, 10:44 PMfam600Need proving some trig identities!!!!!
I'd greatly appreciate is somebody proved the following true.

1. 1-sinx/1+sinx = (secx-tanx)^2

2. sinx+1/cosx+cotx = tanx

3. sin^2x-tan^2x/1-sec^2x = sin^2x - Jul 13th 2007, 11:07 PMred_dog

- Jul 14th 2007, 03:40 AMfam600problems two and three
For second and third problems, how does the second step turn into the third step.:confused::confused::confused:

- Jul 14th 2007, 03:59 AMtopsquark
For the love of God, PLEASE use parenthesis! I wasted more than 10 minutes struggling with this before I understood what you meant. Your question should be typed as

(sinx+1)/(cosx+cotx) = tanx

If you don't understand the confusion, then please review order of operations.

Okay.

-Dan - Jul 14th 2007, 04:04 AMtopsquark
- Jul 14th 2007, 04:29 AMSoroban
Hello, fam600!

Different approaches . . .

Quote:

Multiply top and bottom by

. .

. .

. .

Quote:

We have: .

Quote:

We have: .

- Jul 14th 2007, 06:06 PMfam600
Thanks alot everyone. Sorobon, those different approaches especially helped. Its been a year since my last algebra course and so i've forgotten some of it, thats why i've been having such a hard time with these.