Question

Find the other value of A, if $(\sec 2A-1)(\csc 3A-1)=0$, when one value of A is $0^o$.

Answer 1

$(\sec 2A-1)(\csc 3A-1)=0$
Either $\sec 2A-1=0$ or $\csc 3A=1$
$\sec 2A=\sec 0$ or $\csc 3A=\csc 90$
$2A=0$ or $3A=90$
$A=0^{\circ }$ or $A={30}^{\circ }$