Answer: sin(a+b)= sin(a)*cos(b)+sin(b)*cos(a).
Step-by-step explanation: we can write some trigonometric functions in different ways (some more simplified that others), in the case of the given problem, the expanded equivalent of the expression sin(a+b) can be written as follows:
sin(a+b)= sin(a)*cos(b)+sin(b)*cos(a).
