&\int (x-2)^2 dx\\
&\int (x^2+1)^2 dx\\
&\int (2x+1)(x^2-1)dx\\
&\int d(2x+1)\\
&\int d(x^3+2)\\
&\int x f(x)dx=x^3+3x^2-1,\,\,\, f(x)=?\\
&\int xf(x)dx=x^4-5x^2, \,\,\, f(1)=?\\
&\int f(x)dx=-2x^2+4x+c, \,\,\, f(3)=?\\
&\int \frac{d}{dx}\int x^3+2dx\\
&\int \frac{d}{dx}\int\frac{x^2+1}{x^3-2}dx\\
&\frac{d}{dx}\int d(x^3-2x+1)\\
&f(x)=\int d(x^2+1),\,\,\, f'(4)=?\\
&f(x)=\int (x^3-x+3)dx,\,\,\, f'(-1)=?\\
&f(x)= \int (6x^2-x+1)dx, \, x=2 \,\, olduğunda \,\, f(x)'in \,\, eğimi=?

When I run the code I get the error 'please use \mathaccent for accents in math mode. You can't use \spacefactor in math mode . Command \u invalid in math mode' How can I resolve this issue ?

  • Welcome to the TeX.SE. What is your babel?
    – Sebastiano
    Sep 16, 2020 at 20:55
  • 1
    do not use math italic for multi-letter words, if there are accented letters it gives errors but it looks bad in any case, use \textrm{olduğunda} Sep 16, 2020 at 20:57

1 Answer 1


Text in formulas should be properly segregated.



&\int (x-2)^2 \,dx\\
&\int (x^2+1)^2 \,dx\\
&\int (2x+1)(x^2-1)\,dx\\
&\int d(2x+1)\\
&\int d(x^3+2)\\
&\int x f(x)\,dx=x^3+3x^2-1 &\quad& f(x)=\text{?}\\
&\int xf(x)\,dx=x^4-5x^2,   &\quad& f(1)=\text{?}\\
&\int f(x)\,dx=-2x^2+4x+c,  &\quad& f(3)=\text{?}\\
&\int \frac{d}{dx}\int (x^3+2)\,dx\\
&\int \frac{d}{dx}\int\frac{x^2+1}{x^3-2}\,dx\\
&\frac{d}{dx}\int d(x^3-2x+1)\\
&f(x)=\int d(x^2+1),        &\quad& f'(4)=?\\
&f(x)=\int (x^3-x+3)\,dx,   &\quad& f'(-1)=?\\
&f(x)=\int (6x^2-x+1)\,dx,  &\quad& \text{$x=2$ olduğunda $f(x)$'in eğimi}=\text{?}


enter image description here

Don't forget \, before dx in integrals.

  • thanks a lot mate
    – Enes Senel
    Sep 16, 2020 at 21:00
  • 1
    Do you know also the turkish language :-)? :-)
    – Sebastiano
    Sep 16, 2020 at 21:03
  • 1
    @Sebastiano - If you fire up Google Translate and enter a word of an unknown language into the left-hand box, the software tends to do a very good job identifying the language for you. In the present case, the presence of the letter "ğ" (with a u-shaped accent) pretty much is a dead give-away that the language is Turkish. (I learned from Google Translate this evening that "olduğunda" means "when" and that "eğimi" means "slope".)
    – Mico
    Sep 16, 2020 at 21:13
  • 1
    @Mico It is also true :-)....tomorrow I begin with the school....and my thoughts are often on Venus, or on Moon...:-)
    – Sebastiano
    Sep 16, 2020 at 21:15
  • 1
    @Mico Yes; the “’in” suffix is another telltale.
    – egreg
    Sep 16, 2020 at 21:16

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