Answers

2014-03-10T18:06:24+05:30
(xy)²+(yz)²+2xy²z-((xy)²+(yz)²-2xy²z)
=(xy)²+(yz)²+2xy²z-(xy)²-(yz)^2+2xy²z
=4xy
²z



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2014-03-10T18:37:30+05:30
(xy+yz)² - (xy-yz)²
x²y² + y²z² +2xy²z - (x²y² +y²z² -2xy²z)
x²y² -x²y² +y²z² - y²z² +2xy²z +2xy²z
4xy²z 
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