flexx said:thank you mr steve for your interesting in my problem .
still i dont get this :
If later you encounter something like √1+u^2, use 1+(sh(t))^2 = (ch(t))^2 beter than 1+(tg(t))^2 = (sec(t))^2.
you mean that i must substitute by 1+sin²Θ = cos ²Θ ????
flexx said:i dont get what you mean ,
for your solving , i think you use u² , for each substitution we must substitute by
1+cos²Θ ?
flexx said:and i dont get the ln function in your solveing
2 f (U) = u √1+u2 + ln (u+√1+u²)
what you mean by ln ? we didnt get log yet .
thanking you for your antecipation
flexx said:but how can you write mathmatics symbols using Acrobat ?