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Area of a triangle Pythagorean theorem Internal diagonal of a cube Why is trigonometry useful? sin, cos, tan sin^2+cos^2 = 1 Triangles have area absin(C)/2 Law of cosines sin(A+B) cos(A+B) tan(A+B) The angle between a line and the x-axis The angle between lines

Factorials Infinitely many primes Calculating logarithms in your head Linear regression Linear regression examples Snell's law Snell's law example Deriving Snell's law Coulomb's law