Posted by amanda on Wednesday, March 7, 2007 at 6:33pm.
Hi, I am a senior in High School having a really difficult time with two problems. I have to prove using the trigonometric identities that they equal each other but I am having a really hard time trying to get them to equal each other. I've spent over 2 hours trying to get these two problems right but I can't. I don't know if the math problems themselves are working because there is some error or that I am just doing them wrong (even though I've spent a long time trying various methods to get them correct). So I was wondering if someone could help me really soon. Here are the problems:
Thank you so much!
1: (1+Cotx)^2/Tanx = CosxCsc^3x + 2Cot^2x
2: Cosx/1-Sinx - Tanx = Secx
Here are some basic trig identities to help with this problem.
sin^2x + cos^2x = 1
secx = 1/cosx
tanx = sinx/cosx
Let's try to get the left side to look like the right side.
cosx/(1-sinx) - tanx =
cosx/(1-sinx) - sinx/cosx =
Common denominator is: (1-sinx)(cosx)
cos^2x/(1-sinx)(cosx) - sinx(1-sinx)/(1-sinx)(cosx) =
[cos^2x - (sinx - sin^2x)]/(1-sinx)(cosx) =
(cos^2x + sin^2x - sinx)/(1-sinx)(cosx) =
(1 - sinx)/(1-sinx)(cosx) =
secx = secx
I hope this helps with this one; perhaps someone else can help with the first problem.
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