CotAcotBcotC+ cos(A+B + c)/sinAsinBSinC

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.