Please help me prove this trig identity

{{{ (1-secx)/(1+secx) = (cosx-1)/(cosx+1) }}}

this is the middle of a section and they have turned up the gears, i think if i am shown how i will be able to figure the rest out.

- Thu Feb 16, 2012 3:28 pm
- Forum: Trigonometry
- Topic: Proving trig identities + Pre counter examples
- Replies:
**1** - Views:
**1954**

Please help me prove this trig identity

{{{ (1-secx)/(1+secx) = (cosx-1)/(cosx+1) }}}

this is the middle of a section and they have turned up the gears, i think if i am shown how i will be able to figure the rest out.

{{{ (1-secx)/(1+secx) = (cosx-1)/(cosx+1) }}}

this is the middle of a section and they have turned up the gears, i think if i am shown how i will be able to figure the rest out.

- Sat Feb 04, 2012 8:07 pm
- Forum: Trigonometry
- Topic: pythagoren identities: cosec Theta = a, give other ratios
- Replies:
**5** - Views:
**2731**

{{{ sqrt (1-1/a^2) }}}

sqrt1-1/1-a

a/a*1/1=a/a

sqrt (a^2-1)/a

sqrt1-1/1-a

a/a*1/1=a/a

sqrt (a^2-1)/a

- Wed Feb 01, 2012 8:14 pm
- Forum: Trigonometry
- Topic: pythagoren identities: cosec Theta = a, give other ratios
- Replies:
**5** - Views:
**2731**

hmm i see sqrt(1-1) 1/1 *a/a the a going back under the root gets ^2 theirfore sqrt (a^2 -1)....over a+a Denominators = a... simple fraction rules. i over thought that.

Thanks a 1000^2

Thanks a 1000^2

- Wed Feb 01, 2012 2:23 am
- Forum: Trigonometry
- Topic: pythagoren identities: cosec Theta = a, give other ratios
- Replies:
**5** - Views:
**2731**

I have a question that i am finding a different answer then one given. pleas explain where i am going wrong. given: cosec Theta = a so i know sin = 1/a asked to give remaining ratios. terminates in Quadrant 1 cos = sqrt (1-(1/a)^2) how do they come up with sqrt (a^2-1)/a :oops: i left school too ear...