Das Miscellany
Musings on software, math, guitars and more ...
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Math
Common mathematical rules, techniques, identities and derivations/proofs
Triganometric values for basic angles
For 30, 45 and 60 degrees
Factoring the general quadratic equation
A method
The quadratic formula
To find the roots of the general quadratic equation
Triganometric identities - Proofs
By geometry
Triganometric identities
A few of them anyway