into of course, density has to be multiplied; from here this angle generally is theta is very small then it is a tends to 0 if we take then cos theta is 1. we will assume that theta is very small.
हे गुणिले घनता यावरून वस्तुमान मिळेल. आता θ अगदी लहान असतो त्यामुळे जर तो 0 कडे जाणारा असेल, तर cosθ आपण 1 घेऊ शकतो.