The coefficient of x^3 in the expansion of (x^2-1/x)^5 is
(-1)^3*5C3*x^9 = -10x^9
If x^2-ax+1 is a factor of x^4-ax^3+2x^2-ax+b, then
a = 1 and b = 0
The number of terms in the expansion of (x+y)^n is n+1.
If (x+1/x)^2=3, then
x^5+1/x^5 = 10
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