You seem to be missing some closing parentheses for those bolded open parentheses. Try using a text editor that has parentheses highlighting like notepad2. Also it might be easier to read if you split it up over multiple lines (it's not really more efficient code if you write it all on one line.)
Code:
dist = ( (int)targheight * float sin(((3.14159 / 2) - ((((((int)TILT_SERVO - 190) * (65 / 124)) * (3.14159 / 180)))))) / float sin ( float ( (((((int)TILT_SERVO - 190) * (65 / 124)) * (3.14159 / 180)));