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Trignometry

Blazing goIITian

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1 Apr 2008 15:48:51 IST

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407

find da general solution.......

None

find da general solution.......

4cos@ cos2@ cos3@=1

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Comments (10)

sandeep ramesh

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1 Apr 2008 15:54:32 IST

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cos^2@(2cos^2@-1)(4cos^2@-3) = 1/4

This is a cubic in cos^@

zee.......

Blazing goIITian

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1 Apr 2008 15:57:46 IST

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@ sandeepramesh
i never understud a word u said

sandeep ramesh

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1 Apr 2008 15:59:24 IST

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what did i say that u didnt understand?

dont you know the formula for cos2@ and cos3@ ??

zee.......

Blazing goIITian

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1 Apr 2008 16:02:13 IST

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i know da formulas but what to do next ?
and how did u get 4cos^2@-3 ???
its is suposed to be 4cos^3@ - 3 cos@ rit?

arpan1

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1 Apr 2008 16:03:45 IST

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what is the big deal in it !!!

@ zeeshanp

what is that u do not understand ...

for these type of ques, convert it into a polynomial in cos x..
solve it as u solve a polynomial equation and put conditions to get the ans..

practice makes a man perfect, so u better practice these type of ques. after understanding the fundamentals...

if u are a 12th student, u must know other alternatives...

rate me if useful

arpan1

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1 Apr 2008 16:04:52 IST

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btw, sandeep did a mistake in the formula of cos 3x

sandeep ramesh

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1 Apr 2008 16:07:05 IST

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ignorance is bliss arpan :D :D i didnt make a mistake, see properly! Whats the correct formula then?

Anand Hegde

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1 Apr 2008 16:36:54 IST

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sandeep has written the correct formula only Smile

arpan1

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1 Apr 2008 16:45:24 IST

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@zeeshanp

check ur nudge book for solution

pink_ele

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1 Apr 2008 22:23:27 IST

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4cos@ cos2@ cos3@=1
2(2cos@ cos3@)cos2@=1
2(cos@+cos2@)cos 2@=1
put values
n solve d equation

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