Physically i would plot ysinxquad 0le xle 2pi and measure line length. On the discrete level conditioning is possible only if the condition is of nonzero probability one cannot divide by zero. I think part of the answer.
Trigonometric Substitution
Einfuhrung integration die integration bestimmt den flacheninhalt der flache die zwischen einem von einer funktion bestimmten kurvenzug und der x achse.
This page contains a summary of all of the basic trigonometric identities that you will need to use in a high school trig class organized by type.
