Answers

2015-05-24T18:14:33+05:30
Cosx-sinx=sin2x=>(cosx-sinx)^2=(sin2x)^2
=>1-sin2x=(sin2x)^2, let a = sin2x=>a^2+a-1=0=>a=(-1+5^2)/2
=>sin2x=(-1+5^2)/2=>x=19.086
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