Answer
$\sin A \cos B+\cos A \sin B$
Work Step by Step
The sum formula for the sine function is:
$$\sin (A+B)=\sin A \cos B+\cos A \sin B$$
Thus, the missing expression in the given statement is:
$$\sin A \cos B+\cos A \sin B$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.