Thus , we can easily remember this formura without spent exstra enersy and time. , and it is still usefull to me .
Thus , we can easily remember this formula without spending extra energy and time and it is still useful to me . Thus , we can easily remember this formula without having spent extra energy and time , and it is still useful to me . Thus , we can easily remember this formula without spending extra energy and time , and it is still useful to me . Thus , we can easily remember this formula without spending extra energy and time , and it is still useful to me .