SSC CGL 2024 PYQ — Question 65

The correct answer is option 4 i.e.  $1\over2$ {cos(A-B) - cos(A+B)}.

sinAsinB = $1\over2${cos(A-B) - cos(A+B)}

cosAcosB = $1\over2${cos(A+B) + cos(A-B)}

sinAcosB = ${1\over 2}${sin(A+B) + sin(A-B)}

cosAsinB = $1\over2${sin(A+B) - sin(A-B)}