#goldenratio #ruleandcompass

#angles #trigonometricidentities

#angles #trigonometricidentities it works both ways

#angles #trigonometricidentities

#angles #trigonometricidentities

#angles #trigonometricidentities

#angles #trigonometricidentities #pythagoreanidentities

#taylorpolynomial approximations for f(x)=cos(x)

#angles #sin #cos

#epsilondelta notation for limits
#calculus

#epsilondelta notation for limits
#calculus

Countability of the #rational numbers

The cardinality of the real numbers line is the same as a finite open interval of the #realnumbers line.

fundamental theorem of #calculus