I know of resolving forces into components along x and y axes. But I have this issue. Consider a bob suspended from a string.The string is not perpendicular to the horizontal,but inclined at some angle(due some force,say it is in a non inertial frame). Let the angle be theta(with the vertical). So which of these is correct: a) m*g*cos(theta)=T or b) m*g=T*cos(theta). Why? I have seen both equations used in books. Thank You.