OpenMathBooks

@openmathbooks.bsky.social

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Free math books ranging from elementary level to precalculus level. https://openmath.online/ (in Norwegian) https://sindrsh.github.io/openmathbooks/

A triangle ABC is drawn, with a red and a green square drawn on the outside of AC and BC respectively. D and E is the points on the red and the green square, respectively, diagonal to C.
Bilde av boka.
Given the function ${f(x)=\frac{1}{x}}$, where $D_f=(0, \infty)$. We introduce a coordinate system where the $a$-axis and the $b$-axis lie on the lines described by linjene $y=-x$ and $y=x$, respectively. The graph of the function $b=g(a)$ and the graph of $f$ are identical.