A) \[5{{x}^{2}}-6{{y}^{3}}+15{{z}^{3}}+12xy-36{{y}^{6}}+21x{{y}^{2}}\]
B) \[4{{x}^{2}}+9{{y}^{2}}+25{{z}^{2}}+12xy-30yz-20zx\]
C) \[5{{x}^{2}}-6{{y}^{3}}+15{{z}^{3}}+12xy-36yz+21xy\]
D) \[4{{x}^{2}}+9{{y}^{2}}+25{{z}^{2}}-12xy+30yz+20zx\]
E) None of these
Correct Answer: B
Solution :
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