exam Maths Puzzle Numerical Ability

x^3y+2x^2y^2+xy^3

I came up with the answer can you let me knwo if i am correct
x(x^2y+y^3+2xy^2)
xy(x^2+y^2+2xy)

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exam Other Question

please help me solve this equation by substitution
y=2x+3
y=3x+1 Prove that Cot(theta) divided by (1-Tan (theta) )+ Tan(theta) divided by (1-Cot(theta) )is equal to 1+Tan(Theta)+Cot (Theta)
Show step by step how left side is equal to right sid