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pythagoren identities: cosec Theta = a, give other ratios  TOPIC_SOLVED

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...
by ianhendry
on Wed Feb 01, 2012 2:23 am
 
Forum: Trigonometry
Topic: pythagoren identities: cosec Theta = a, give other ratios
Replies: 5
Views: 1753

Re: pythagoren identities: cosec Theta = a, give other ratio  TOPIC_SOLVED

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. :thumb: :clap:

Thanks a 1000^2
by ianhendry
on Wed Feb 01, 2012 8:14 pm
 
Forum: Trigonometry
Topic: pythagoren identities: cosec Theta = a, give other ratios
Replies: 5
Views: 1753

Re: pythagoren identities: cosec Theta = a, give other ratio  TOPIC_SOLVED

{{{ sqrt (1-1/a^2) }}}
sqrt1-1/1-a
a/a*1/1=a/a
sqrt (a^2-1)/a
by ianhendry
on Sat Feb 04, 2012 8:07 pm
 
Forum: Trigonometry
Topic: pythagoren identities: cosec Theta = a, give other ratios
Replies: 5
Views: 1753

Proving trig identities + Pre counter examples  TOPIC_SOLVED

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. :popcorn:
by ianhendry
on Thu Feb 16, 2012 3:28 pm
 
Forum: Trigonometry
Topic: Proving trig identities + Pre counter examples
Replies: 1
Views: 1346

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