Question 147846
{{{( sin(2x) / ( 1 + cos(2x) ) ) * ( cos(x) / ( 1 + cos(x) ) ) = tan(x/2)}}}
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{{{( 2sin(x)cos(x) / ( 1 + cos^2(x) - sin^2(x) ) ) * ( cos(x)/( 1 + cos(x) ) ) = tan
(x/2)}}}
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{{{( 2sin(x)cos(x) / ( 1 + cos^2(x) - ( 1 - cos^2(x) ) ) ) * ( cos(x)/( 1 + cos(x) ) ) = tan(x/2)}}}
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{{{2sin(x)cos(x) / ( 2cos^2(x) ) * cosx/( 1 + cos(x) ) = tan(x/2)}}}
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{{{sin(x) / ( 1 + cos(x) ) = tan(x/2)}}}
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{{{sin(x) / ( 1 + cos(x) ) = sin(x/2) / cos(x/2)}}}
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{{{sin(x) / ( 1 + cos(x) ) = sqrt((1 - cos(x)) / 2) / sqrt((1 + cos(x)) / 2)}}}
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{{{sin(x) / ( 1 + cos(x) ) = sqrt(1 - cos(x)) / sqrt(1 + cos(x))}}}
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{{{sin(x) / ( 1 + cos(x) ) = sqrt( (1 - cos(x)) / (1 + cos(x)))}}}
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{{{sin(x) / ( 1 + cos(x) ) = sqrt( (1 - cos(x))(1 + cos(x)) / (1 + cos(x))^2)}}}
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{{{sin(x) / ( 1 + cos(x) ) = sqrt( (1 - cos^2(x)) / (1 + cos(x))^2)}}}
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{{{sin(x) / ( 1 + cos(x) ) = sqrt( sin^2(x) / (1 + cos(x))^2)}}}
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{{{sin(x) / ( 1 + cos(x) ) = sin(x) / (1 + cos(x))}}}