TRIGO

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1. if n is an odd integer (â‰ 1) and -Î <x<0 . Then the solution of the equation cos ⁿx - sinⁿx = 1 . is given by
(a) -Î /6 (b) -Î /4 (c) -Î /3 (d) -Î /2

#Mathematics #Trignometry

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tapanmast Vora ·2009-03-17 18:49:26

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kamalendu ghosh ·2009-03-17 18:59:34

n is odd...toh ami ektu chorami korlam.... take n=1

so we have cosx- sinx=1

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kamalendu ghosh ·2009-03-17 19:00:00

ans d

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kamalendu ghosh ·2009-03-17 19:01:49

[3]

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kamalendu ghosh ·2009-03-17 19:22:41

cos^nx -sin ^nx=(cosx-sinx)(**************)

(****************)= always of the form such that if(****************) is =1 then sinx=0 or -Ï€ and cosx=1

but ,,,,,, that is nt possible as -Ï€<x<0

so... only cosx-sinx=1 will gv the solutions..

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TRIGO

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