Applicare la formula: $x+a=b$$\to x=b-a$, dove $a=\tan\left(x\right)$, $b=3x$, $x+a=b=\tan\left(x\right)+\sec\left(y\right)=3x$, $x=\sec\left(y\right)$ e $x+a=\tan\left(x\right)+\sec\left(y\right)$

Applicare la formula: $a=b$$\to inverse\left(a,a\right)=inverse\left(a,b\right)$, dove $a=\sec\left(y\right)$ e $b=3x-\tan\left(x\right)$

Applicare la formula: $\mathrm{arcsec}\left(\sec\left(\theta \right)\right)$$=\theta $, dove $x=y$