Question 1133873


 if {{{sin (A)=6/13}}}=>{{{A=sin ^-1(6/13)}}}=>{{{A=27.49}}}°

 and if {{{sec(B)=13/6 }}}=>{{{sec(B)=1/cos(B) }}}

=>{{{1/cos(B)=13/6 }}}

=>{{{cos(B)=1/(13/6)}}}
=>{{{cos(B)=6/13}}}
{{{B=cos^-1(6/13)}}}
{{{B=62.51}}}°


then {{{A+B=27.49+62.51}}}° 

{{{A+B=90}}}°