use the expansion equation
sin(A+B) = sinAcosB + cosAsinB
sin(x + π) = sinxcosπ + cosxsinπ
= sinx(-1) + cosx(0)
= -sinx
Show that sin(x+pi)=-sinx. Show all of your work.
3 answers
sin(xπi) = sinx cosπ + cosx sinπ
Thank you Reiny and oobleck!