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If sinx+sin2x=1 then cox+co2x=?

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Sinx + sin2x = 1
2 sin 3x/2  cos x/2  = 1
cos x/2 = 1 / (2 sin 3x/2 )

cos x + cos 2x =  2 cos x/2 cos 3x/2  substitute value of cos x/2 from above
   = cos 3x/2  / sin 3x/2  =  cot 3x/2 

Posted by

Satyajeet Kumar

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