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Aug
2
revised Elegant solution for $\int {\frac{\cos(y)}{\sin^2(y)+\sin(y)-6}}dy$
LaTeX
Aug
2
comment A question on inequality and differentiation of logarithms
Related to the reverse of Jensen's inequality: en.wikipedia.org/wiki/Jensen%27s_inequality
Aug
2
answered Question on matrices
Aug
2
answered Find the sum of all products of two distinct naturals, neither exceeding 2015.
Jul
31
revised Help in finding the integral function.
readab;e LaTeX
Jul
31
reviewed Approve Help in finding the integral function.
Jul
31
comment Solve differential equation
@Jason yes, indeed
Jul
31
comment Solve differential equation
i think you get $\sin x + \ln |\sec x|$, and must carry the absolute value unless you restrict yourself to the interval where $\cos x \ge 0$...
Jul
31
revised Showing that the sequence $x_n=\frac{1}{3}x_{n-1}(4+x_{n-1}^3)$ where $x_0=-0.5$ quadratically converges
added 4 characters in body
Jul
31
answered Solve differential equation
Jul
31
answered Find inverse operator
Jul
31
comment What does it actually mean if a cost function is differentiable?
@Karnivaurus some derivatives are hard to analytically express :)
Jul
31
answered What does it actually mean if a cost function is differentiable?
Jul
31
revised What does it actually mean if a cost function is differentiable?
LaTeX
Jul
31
comment Polynomial Interpolation and Data Integrity
When you say you evaluate $f$ at $x$, do you mean that $f:\mathbb{R} \to \mathbb{R}$ is a 1-D polynomial and $y_i=f(x_i)$ or that $f:\mathbb{R}^n \to \mathbb{R}^n$ is a vector-valued polynomial which takes $n$ inputs and returns $n$ outputs?
Jul
31
revised What is the next value in this sequence?
added 18 characters in body; edited tags; edited title
Jul
31
revised How can I obtain this division's limit without using derivatives?
added 11 characters in body
Jul
30
reviewed Approve washer method calculus help
Jul
30
comment In what conditions a quadratic function has an integer value of $f(x)$ where $x$ is also an integer?
$y \in \mathbb{Z}$ iff $a,b,c \in \mathbb{Z}$
Jul
30
answered Use graphical methods to solve the linear programming problem. Maximize: