sin(a-b)cosb+cos(a-b)sinb=?

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sin(a-b)cosb+cos(a-b)sinb=?sin(a-b)cosb+cos(a-b)sinb=?sin(a-b)cosb+cos(a-b)sinb=?sin(a-b)cosb+cos(a-

sin(a-b)cosb+cos(a-b)sinb=?
sin(a-b)cosb+cos(a-b)sinb=?

sin(a-b)cosb+cos(a-b)sinb=?
sin(a-b)cosb+cos(a-b)sinb
=sin(a-b+b)
=sina