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[(sin x)/(cos3x)+(sin3x)/(cos9x)+(sin9x)...

[(sin x)/(cos3x)+(sin3x)/(cos9x)+(sin9x)/(cos27x)=lambda[tan27x-tan x],[" Then "x=(1)/(2)" ."4(1)/(7)],[" 1) "1]

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show that (sinx)/(cos3x)+(sin3x)/(cos9x)+(sin9x)/(cos27x)=1/2(tan27x-tanx)

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Number of solution (s) of the equation (sin x)/( cos 3 x) +( sin 3 x )/( co 9 x) + ( sin 9 x )/( cos 27 x) = 0 in the interval (0, (pi)/( 4)) is