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# Trig proof help watch

1. Hi guys, I was a little stuck on this trig proof. I was wondering if anyone could help me:
(cotx-cosx)/(1-sinx) = cotx

Thanks
2. (Original post by loooolo12345)
Hi guys, I was a little stuck on this trig proof. I was wondering if anyone could help me:
(cotx-cosx)/(1-sinx) = cotx

Thanks
Try converting everything to sines and cosines - what do you get? Post your working so we can help.
3. ok thanks

So: [(cosx/sinx)-cosx]/(1-sinx)
4. (Original post by loooolo12345)
ok thanks

So: [(cosx/sinx)-cosx]/(1-sinx)
Common denominators on the numerator:

5. (Original post by Zacken)
Common denominators on the numerator:

Ah ok so can you do:

[cotx(1-sinx)]/(1-sinx)

then cancel out 1-sinx?
6. (Original post by loooolo12345)
Ah ok so can you do:

[cotx(1-sinx)]/(1-sinx)

then cancel out 1-sinx?
Perfecto.
7. (Original post by Zacken)
Perfecto.
Thats great! thank you so much for your help!
8. (Original post by loooolo12345)
Thats great! thank you so much for your help!
No problem. :-)

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