Calculus
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Find lim x->-9 (x^2+6x-27)/(x+9)
-12
Differentiate y=arcsin(2x)
12
If f(x)=xe^-x, then at x=0....
f is increasing
If f(x)=2x^2+4, which of the following will calculate the derivative of f(x)?
x->0 [2(x+∆x)^2+4]-(2x^2+4)]/∆x
