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You can put this solution on YOUR website!
tan(y) = sin(y)/cos(y)
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document.write( "2sin(y) = sin(y)/cos(y)
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document.write( "2sin(y)cos(y)=sin(y)
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document.write( "2cos(y) = sin(y)/sin(y) = 1
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document.write( "cos(y) = 1/2
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document.write( "y = pi/3 + 2pi*n and 5pi/3 + 2pi*n