https://s0.wp.com/latex.php?latex=%5Cdisplaystyle+%5CRightarrow+x+%3D+%5Ctan+%5CBig%28%C2%A0+%5Cfrac%7B%5Cpi%7D%7B2%7D%C2%A0+-+%5Csin%5E%7B-1%7Dx+%5CBig%29+&bg=%23ffffff&fg=%23111111&s=0&c=20201002