Functions may be entered as calculations on a degree or radian measure of angle. However, if using degrees, enter the degree symbol. Shortcuts are alt+o on windows 10; or command shift 8 on mac.[br][br]Please pay attention to brackets as follows:[br]When parameter b is entered brackets are f(x) = a sin (bx[sup]o[/sup])+d;[br]When parameter c is entered brackets are f(x) = a sin ((x-c)[sup]o[/sup])+d;[br]When parameters b and c are both entered brackets required are f(x) = a sin ((b(x-c))[sup]o[/sup])+d or [br]f(x)=a sin ((bx-bc)[sup]o[/sup])+d.