[phpBB Debug] PHP Warning: in file [ROOT]/ext/lmdi/autolinks/event/listener.php on line 237: Undefined array key 9 [phpBB Debug] PHP Warning: in file [ROOT]/ext/lmdi/autolinks/event/listener.php on line 237: Trying to access array offset on value of type null Solve the equation for solutions over the interval [0°, 360°). 20+9 tan 0+6=0 - Answer Happy