Asked by Allie

Show that sin(x+pi)=-sinx. Show all of your work.

5 years ago

Answered by Reiny

use the expansion equation
sin(A+B) = sinAcosB + cosAsinB

sin(x + π) = sinxcosπ + cosxsinπ
= sinx(-1) + cosx(0)
= -sinx

5 years ago

Answered by oobleck

sin(xπi) = sinx cosπ + cosx sinπ

5 years ago

Answered by Allie

Thank you Reiny and oobleck!

5 years ago

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