Integraal van $$$- \tan{\left(1 \right)} \tan{\left(x \right)} \sec{\left(x \right)}$$$
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Uw invoer
Bepaal $$$\int \left(- \tan{\left(1 \right)} \tan{\left(x \right)} \sec{\left(x \right)}\right)\, dx$$$.
Oplossing
Pas de constante-veelvoudregel $$$\int c f{\left(x \right)}\, dx = c \int f{\left(x \right)}\, dx$$$ toe met $$$c=- \tan{\left(1 \right)}$$$ en $$$f{\left(x \right)} = \tan{\left(x \right)} \sec{\left(x \right)}$$$:
$${\color{red}{\int{\left(- \tan{\left(1 \right)} \tan{\left(x \right)} \sec{\left(x \right)}\right)d x}}} = {\color{red}{\left(- \tan{\left(1 \right)} \int{\tan{\left(x \right)} \sec{\left(x \right)} d x}\right)}}$$
De integraal van $$$\tan{\left(x \right)} \sec{\left(x \right)}$$$ is $$$\int{\tan{\left(x \right)} \sec{\left(x \right)} d x} = \sec{\left(x \right)}$$$:
$$- \tan{\left(1 \right)} {\color{red}{\int{\tan{\left(x \right)} \sec{\left(x \right)} d x}}} = - \tan{\left(1 \right)} {\color{red}{\sec{\left(x \right)}}}$$
Dus,
$$\int{\left(- \tan{\left(1 \right)} \tan{\left(x \right)} \sec{\left(x \right)}\right)d x} = - \tan{\left(1 \right)} \sec{\left(x \right)}$$
Voeg de integratieconstante toe:
$$\int{\left(- \tan{\left(1 \right)} \tan{\left(x \right)} \sec{\left(x \right)}\right)d x} = - \tan{\left(1 \right)} \sec{\left(x \right)}+C$$
Antwoord
$$$\int \left(- \tan{\left(1 \right)} \tan{\left(x \right)} \sec{\left(x \right)}\right)\, dx = - \tan{\left(1 \right)} \sec{\left(x \right)} + C$$$A