If Sin A+ Sin B = x and cos A+cos B = y prove that tan (a-b/2) = +-√ 4x² - y2/
x² + y2 and tan (a+b/2) =
Y
2​

Name three things the framers of the constitution did to keep the federal government or any part of it from becoming too powerful.

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.

What was the greatest contribution of the “scientific method”?