Question

sin43 cos 47sin 47 cos 43

Answer 1

i assume there's a + in between
=sin43 cos(90-43) +sin(90-43) cos 43
=sin 43 sin43 +cos43 cos43
=sin^2(43) + cos^2(43)
=1

Answer 2

cos47=cos(90-43)=sin43
sin47=sin(90-43)=cos43
=sin43.sin43.cos43.cos43
=sin^2 43.cos^2 43