HELP PLEASE 30 POINTS! WILL MARK BRAINLIEST IF CORRECT Verify the identity. & Show your work.

cos (x - y) - cos (x + y) = 2 sin x sin y

Which of the following describes how to translate the graph y = xi to obtain the graph of y = x - 11 - 12 1 unit left and 1 unit down 1 unit left and 1 unit up 1 unit right and 1 unit down 1 unit right and 1 unit up

The distributive property allows you to say that 3(x − 1) = 3x −

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9