## mari69755 one year ago verify equation identity (1-cot^2)/(1+cot^2)+1=2 sin^2

1. mari69755

I try solving it and it was not an identity but I am not sure I am right.

|dw:1398203236677:dw|

3. mari69755

yeah i I did that but at the end of it I did not get the 2sin^2

|dw:1398203617892:dw|

5. mari69755

yes

At the end use property sin^2 + cos^2 = 1

at denominator

8. mari69755

yeah that would give me 1/sin^2

10. mari69755

wait would my denominator be (sin^2+cos^2)/ sin^2?

|dw:1398204432505:dw|

12. mari69755

|dw:1398204540377:dw|

similarly at denominatior , so sin^2 get cancel from both numerator & denominator ..

14. mari69755

oh wow. so there would only be left -cos^2 right

|dw:1398204881696:dw|

Okay ?

17. mari69755

yeah i understand that

what would be the next step ?

lcd

Are you there ?

21. mari69755

use the denominator equal one

|dw:1398205488285:dw|

So what do you get ?

24. mari69755

at the top part do you multiply the a times y?

in our step x = (sin^2 - cos^ ) & y = sin^2 + cos^2 & a = 1

26. mari69755

yes so it would be sin^2-cos^2+(sin^2-cos^2) all divided by sin^2+cos^2?

27. mari69755

okay I understood it never mine. Thank you so much for your help. I did get 2sin^2 at the end.