Question

What is the value of SinA+SinB?​

Answer 1

Answer:

SinA+ sinB =2[{sin(A+B)/2}{ cos(A-B) /2}]

proof:

sin(X+Y) + sin(X-Y) = 2(sinXcosY)

let X + Y = A

and X - Y = B

=> X = (A + B)/2 & Y = (A - B)/2

By Substituting, we obtain the following equation

sinA+ sinB =2[{sin(A+B)/2}{ cos(A-B) /2}]

Step-by-step explanation: