Boris Active member
| Subject: Trignometric Identities Sat Mar 07, 2009 3:56 pm | |
| hey frndz I am havin problem in these question:-
1. cosec^6A-cot^6A=3cot^2A cosec^2A+1
2. sec^6A-tan^6A=1+3tan^2A+3tan^4A
I have used '^' sign to show 'to the power of '
pls post the ans soon
Last edited by Boris Prashant on Sat Mar 07, 2009 8:49 pm; edited 1 time in total |
|
Shruti !!! Active member
| Subject: Re: Trignometric Identities Sat Mar 07, 2009 8:20 pm | |
| hey phewwww... head breakin sum wit silly ans... the second one is simple..
L.H.S
(sec2A)3 -tan6A
(1+tan­­2A)3 –tan6A
apply this........ (a2+b2)3
1+tan6A+3tan2A+3tan4A-tan6A
1+3tan2A+3tan4A
L.H.S =RHS i'll post the first one soon!!!!
Last edited by Shruti Saha on Sat Mar 07, 2009 10:10 pm; edited 1 time in total |
|
Boris Active member
| Subject: Re: Trignometric Identities Sat Mar 07, 2009 8:42 pm | |
| thanxxx
and sorry I posted the Topic Heading wrong It shud be " Trignometric Identities "
I hav corrected it |
|
QUEST Active member
| Subject: Re: Trignometric Identities Sat Mar 07, 2009 8:55 pm | |
| cosec^2 A) ^3 - (cot^2A)^3 = (cosec^2A - cot^2 A)^ 3 + 3( cosec^2A.cot^2A)( cosec^2A - cot^2A)
= 1 + 3 ( cosec^2A.cot^2A). ( Use formula ; a^3 - b ^3 = ( a - b ) ^3 + 3 ab( a - b ) |
|
siya Active member
| Subject: Re: Trignometric Identities Sat Mar 07, 2009 9:04 pm | |
| hey qest...in ur soln...i think one thing i rong..i.e, (cosec^2 A) ^3 - (cot^2A)^3 = ((cosec^2A - cot^2 A))^3 + 3( cosec^2A.cot^2A)( cosec^2A - cot^2A)=(1)^3+ 3 ( cosec^2A.cot^2A). =1+3 ( cosec^2A.cot^2A). d difference is only in 2nd line...u dit put d power 3 on(cosec^2A - cot^2 A)... |
|
QUEST Active member
| Subject: Re: Trignometric Identities Sat Mar 07, 2009 9:17 pm | |
| ?????? |
|
siya Active member
| Subject: Re: Trignometric Identities Sun Mar 08, 2009 12:52 pm | |
| hey hey hey hey.....sorrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrryyyyy ....i read rong...i think i l have 2 go for n eyesight test 2day...i dint read d power 3 on it....sorrrrrrrrry... |
|
Apurva Active member
| Subject: Re: Trignometric Identities Sun Mar 08, 2009 1:31 pm | |
| siya aaj to eye sight test ke liye mat hi jao kal chale jaana |
|
siya Active member
| Subject: Re: Trignometric Identities Sun Mar 08, 2009 1:58 pm | |
| hehehhe yeah sure!! |
|
Sponsored content
| Subject: Re: Trignometric Identities | |
|
|
|