Alignment in latex

Question

I am putting my solutions in latex format but I can't write it properly because I can't align (see image). Is there any way that I can align the u and du to the integrands in the image?

Zarko · Accepted Answer

Like this?

documentclass{article}
usepackage{amsmath}

begin{document}

begin{align}
intfrac{cos y}{sin y}, dy  & = intfrac{cos x}{sin x}, dx  
begin{aligned}
 u & = sin y                           
du & = cos(y), dy
end{aligned}                   &qquad begin{aligned}
                                     u & = cos x       
                                    du & = -sin(x), dx
                                        end{aligned}
end{align}

end{document}

or

documentclass{article}
usepackage{amsmath}

begin{document}

begin{equation}
underbrace{intfrac{cos y}{sin y}, dy}_{%
           begin{aligned}
            u & = sin y       
           du & = cos(y), dy
           end{aligned}}     = underbrace{intfrac{cos x}{sin x}, dx}_{%
                                   begin{aligned}
                                    u & = cos x       
                                   du & = -sin(x), dx
                                       end{aligned}}
end{equation}

end{document}

egreg · Answer

You may want to have the substitutions right aligned with the integral on the left and left aligned with the one on the right.
You can use alignat in order to make multiple alignment points.
documentclass{article}
usepackage{amsmath}

begin{document}

begin{alignat*}{2}
intfrac{cos(y)}{sin(y)}, dy  & ={} &&! intfrac{cos(x)}{sin(x)}, dx  
begin{aligned}
 u & = sin(y) 
du & = cos(y), dy
end{aligned}
&&&
begin{aligned}
 u & = cos(x) 
du & = -sin(x), dx
end{aligned}
end{alignat*}

end{document}

I won't question the math, which seems just a mockery for a real situation.
Notes.

={} is needed in order to get correct spacing: no space after the = sign would be added by TeX, otherwise.
! before int is needed to avoid incorrect spacing: after an odd-numbered &, alignat adds {} (that is responsible for the correct spacing of the relation symbol that usually starts even-numbered columns); in this case it would add a thin space because int follows immediately.

Alignment in latex

2 Answers

Add your own answers!

Ask a Question