Archive for the ‘Identität’ Category

h1

useful identity

February 14, 2009

\frac {1}{ab} = \frac {1}{b - a} \left ( \frac1{a} - \frac1{b} \right )

h1

trig

November 12, 2008

\displaystyle\frac 1{\sin z}=\frac 1{\tan \frac{z}{2}}-\frac 1{\tan z}
\displaystyle \arcsin ({\cos x})+\arccos ({\cos x}) =\frac{\pi}{2}

h1

sin, cos, tan, sec, csc, ct ……

March 22, 2008