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Mathematics
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Red Five's user avatar
Red Five's user avatar
Red Five
  • Member for 5 months
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  • Melbourne, Australia
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High school Mathematics teacher with an interest in historical (pre 1915) school Mathematics exams/University entrance exams as they seem to be full of rich ideas that are simply not taught anymore in schools.

Which is a great loss.

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25
Minimum of $\frac{x^3}{x-6}$ for $x>6$ without using derivative?
8
Solving $p\sin^{4}{\theta}-q\sin^{4}{\phi}=p$ and $p\cos^{4}{\theta}-q\cos^{4}{\phi}=q$ for $\theta$ and $\phi$
8
Finding a more efficient solution to a trigonometric identity problem.
6
Eliminating $\theta$ from $x^2+y^2=\frac{x\cos3\theta+y\sin3\theta}{\cos^3\theta}$ and $x^2+y^2=\frac{y\cos3\theta-x\sin3\theta}{\cos^3\theta}$
6
Can a connected planar graph have 10 vertices and edges? is this possible?