1.

If sinx +sin ^x=1, show that cos ^4 x+cos^2x=1 .

Answer» Right answer
Sinx + sin^2x = 1 (given) Sinx=1-sin^2xSinx= cos^2Squaring both side.So we getSin^2x=cos^4x1-cos^2x = cos^4xCos^4x + cos ^2x = 1 PROVED


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