I need help understanding these trig identities:
Where I see this identity I also see it followed up by this identity:
Huh? I recall that:
So cos(b)sin(a) becomes:
Right? but this is NOT equal to the sin(a)cos(b) equation above. Shouldn't it be?
I know that xy=yx so shouldn't cos(b)sin(a) = sin(a)cos(b)?
Where is my logic flawed...