Integraal van $$$- \csc^{2}{\left(6 x \right)} + \sec^{2}{\left(5 x \right)}$$$

Bepaal $$$\int \left(- \csc^{2}{\left(6 x \right)} + \sec^{2}{\left(5 x \right)}\right)\, dx$$$.

Integreer termgewijs:

$${\color{red}{\int{\left(- \csc^{2}{\left(6 x \right)} + \sec^{2}{\left(5 x \right)}\right)d x}}} = {\color{red}{\left(- \int{\csc^{2}{\left(6 x \right)} d x} + \int{\sec^{2}{\left(5 x \right)} d x}\right)}}$$

Zij $$$u=5 x$$$.

Dan $$$du=\left(5 x\right)^{\prime }dx = 5 dx$$$ (de stappen zijn te zien »), en dan geldt dat $$$dx = \frac{du}{5}$$$.

Dus,

$$- \int{\csc^{2}{\left(6 x \right)} d x} + {\color{red}{\int{\sec^{2}{\left(5 x \right)} d x}}} = - \int{\csc^{2}{\left(6 x \right)} d x} + {\color{red}{\int{\frac{\sec^{2}{\left(u \right)}}{5} d u}}}$$

Pas de constante-veelvoudregel $$$\int c f{\left(u \right)}\, du = c \int f{\left(u \right)}\, du$$$ toe met $$$c=\frac{1}{5}$$$ en $$$f{\left(u \right)} = \sec^{2}{\left(u \right)}$$$:

$$- \int{\csc^{2}{\left(6 x \right)} d x} + {\color{red}{\int{\frac{\sec^{2}{\left(u \right)}}{5} d u}}} = - \int{\csc^{2}{\left(6 x \right)} d x} + {\color{red}{\left(\frac{\int{\sec^{2}{\left(u \right)} d u}}{5}\right)}}$$

De integraal van $$$\sec^{2}{\left(u \right)}$$$ is $$$\int{\sec^{2}{\left(u \right)} d u} = \tan{\left(u \right)}$$$:

$$- \int{\csc^{2}{\left(6 x \right)} d x} + \frac{{\color{red}{\int{\sec^{2}{\left(u \right)} d u}}}}{5} = - \int{\csc^{2}{\left(6 x \right)} d x} + \frac{{\color{red}{\tan{\left(u \right)}}}}{5}$$

We herinneren eraan dat $$$u=5 x$$$:

$$- \int{\csc^{2}{\left(6 x \right)} d x} + \frac{\tan{\left({\color{red}{u}} \right)}}{5} = - \int{\csc^{2}{\left(6 x \right)} d x} + \frac{\tan{\left({\color{red}{\left(5 x\right)}} \right)}}{5}$$

Zij $$$u=6 x$$$.

Dan $$$du=\left(6 x\right)^{\prime }dx = 6 dx$$$ (de stappen zijn te zien »), en dan geldt dat $$$dx = \frac{du}{6}$$$.

Dus,

$$\frac{\tan{\left(5 x \right)}}{5} - {\color{red}{\int{\csc^{2}{\left(6 x \right)} d x}}} = \frac{\tan{\left(5 x \right)}}{5} - {\color{red}{\int{\frac{\csc^{2}{\left(u \right)}}{6} d u}}}$$

Pas de constante-veelvoudregel $$$\int c f{\left(u \right)}\, du = c \int f{\left(u \right)}\, du$$$ toe met $$$c=\frac{1}{6}$$$ en $$$f{\left(u \right)} = \csc^{2}{\left(u \right)}$$$:

$$\frac{\tan{\left(5 x \right)}}{5} - {\color{red}{\int{\frac{\csc^{2}{\left(u \right)}}{6} d u}}} = \frac{\tan{\left(5 x \right)}}{5} - {\color{red}{\left(\frac{\int{\csc^{2}{\left(u \right)} d u}}{6}\right)}}$$

De integraal van $$$\csc^{2}{\left(u \right)}$$$ is $$$\int{\csc^{2}{\left(u \right)} d u} = - \cot{\left(u \right)}$$$:

$$\frac{\tan{\left(5 x \right)}}{5} - \frac{{\color{red}{\int{\csc^{2}{\left(u \right)} d u}}}}{6} = \frac{\tan{\left(5 x \right)}}{5} - \frac{{\color{red}{\left(- \cot{\left(u \right)}\right)}}}{6}$$

We herinneren eraan dat $$$u=6 x$$$:

$$\frac{\tan{\left(5 x \right)}}{5} + \frac{\cot{\left({\color{red}{u}} \right)}}{6} = \frac{\tan{\left(5 x \right)}}{5} + \frac{\cot{\left({\color{red}{\left(6 x\right)}} \right)}}{6}$$

Dus,

$$\int{\left(- \csc^{2}{\left(6 x \right)} + \sec^{2}{\left(5 x \right)}\right)d x} = \frac{\tan{\left(5 x \right)}}{5} + \frac{\cot{\left(6 x \right)}}{6}$$

Voeg de integratieconstante toe:

$$\int{\left(- \csc^{2}{\left(6 x \right)} + \sec^{2}{\left(5 x \right)}\right)d x} = \frac{\tan{\left(5 x \right)}}{5} + \frac{\cot{\left(6 x \right)}}{6}+C$$

$$$\int \left(- \csc^{2}{\left(6 x \right)} + \sec^{2}{\left(5 x \right)}\right)\, dx = \left(\frac{\tan{\left(5 x \right)}}{5} + \frac{\cot{\left(6 x \right)}}{6}\right) + C$$$A