Matematik Opgaver 1235

A: $LaTex: \int x\cdot cos(x)dx = sin(x)\cdot x-\int sin(x)\cdot1dx = sin(x)\cdot x+cos(x)+k$
B: $LaTex: \int3x\cdot ln(x)dx = (x\cdot ln(x)-x)\cdot3x-\int(x\cdot ln(x)-x)\cdot3dx = 3x^2\cdot ln(x)-3x^2-3x \cdot ln(x)-3x$
D: $LaTex: \int x^2\sqrt{x}dx = \frac{2}{3}x^{\frac{3}{2}}\cdot x^2-\int \frac{2}{3}x^{\frac{3}{2}}\cdot2x = \frac{2}{3}x^{\frac{3}{2}}\cdot x^2-\left(\right)$
E: $\text{[math]}$

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