Sin 2A = sinA is true when A=?​

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

What are different types of statistical programs

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?