Sin 40°cos 10°-sin 10°cos 40°

Question

Sin 40°cos 10°-sin 10°cos 40°

Answer 1

(sin30°+sin50°)/2-(sin(-30°)+sin50²)/2=sin60°/2=sin30°=1/2

Answer 2

Sin40 cos10-sin10 cos40=sin(40-10)=sin30=0,5