Question

derivative of sin(x+3)

Answer 1

cos(x+3) * d/dx (x+3) yields cos(x+3)

Answer 2

craneology is right

Answer 3

if i need to rewrite it as a sum identity for sine, would it be.. sin(x+3) = sinx*cos3 + cosx*sin3 ?

Answer 4

yes, you are right!
sin(x+3) = sinx*cos3 + cosx*sin3
=)