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1.3: Cómo leer y escribir matemáticas
https://espanol.libretexts.org/Matematicas/Combinatoria_y_Matematicas_Discretas/Un_libro_de_trabajo_en_espiral_para_matem%C3%A1ticas_discretas_(Kwong)/01%3A_Introducci%C3%B3n_a_las_Matem%C3%A1ticas_Discretas/1.03%3A_C%C3%B3mo_leer_y_escribir_matem%C3%A1ticas
$(x+y)^2 = (x+y)(x+y) = x^2+xy+xy+y^2 = x^2+2xy+y^2, \nonumber$ $\begin{align} (x+y)^2 &= (x+y)(x+y) \\ &= x^2+xy+xy+y^2 \\ &= x^2+2xy+y^2. \end{align} \nonumber$ \[\begin{align} (x+y)^5 &= (x+y)^... $(x+y)^2 = (x+y)(x+y) = x^2+xy+xy+y^2 = x^2+2xy+y^2, \nonumber$ $\begin{align} (x+y)^2 &= (x+y)(x+y) \\ &= x^2+xy+xy+y^2 \\ &= x^2+2xy+y^2. \end{align} \nonumber$ $\begin{align} (x+y)^5 &= (x+y)^2 (x+y)^3 \\ &= (x^2+2xy+y^2) (x^3+3x^2y+3xy^2+y^3) \\ &= x^5+3x^4y+3x^3y^2+x^2y^3+2x^4y+6x^3y^2+6x^2y^3+2xy^4 \\ & \quad {} +x^3y^2+3x^2y^3+3xy^4+y^5 \\ &= x^5+5x^4y+10x^3y^2+10x^2y^3+5xy^4+y^5. \end{align} \nonumber$

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