Question

sin43°×cos13°-cos43°×sin13

Answer 1

$sin43^{0}cos13^{0}-cos43^{0}sin13^{0}=sin(43^{0}-13^{0})=sin30^{0}= frac{1}{2}$

Answer 2

$sin43cos13-cos43sin13=sin(43-13)=sin30= frac{1}{2}$