Yago schrieb:
Respect to your second kindly comment, in the Spanish Navy Naval
Military School (I am Commander in the Spanish Navy, Hydrographer) the
brackets are omited in the notation to the half addition or difference
of trigonometrical functions because the formula,
sin1/2(A+B)
in purity is the product of sin1/2 (I suppose in radians) and the
addition of the angles A and B (also in radians).
There are strict rules in math how to typeset formulas.
sin1/2
means
sin*1/2
(when the "sin" would not be upright, it would even mean s*i*n*1/2)
So "sin" is in your typesetting a variable or an operator but not a function. A function has to have
an argument. For arguments round brackets are used:
sin(0.5(a+b))
When you have several levels of brackets it is allowed to use brackets for the
outer ones:
sin[0.5(a+b)]
although this is quite unusual. Normally one uses larger round brackets for the outer level and
smaller ones for the inner level as explained in LyX's Math manual.
Reading
sin1/2(a+b)
I first thought that you mean
sqrt(sin(a+b))
although the 1/2 would then have to be set as superscript.
You definitively need a bracket behind sin and the like, no matter where you are working. Math is
the same all over the world and it is important that everybody can understand what you are writing.
regards Uwe
