Product Rule. If the two functions f(x) and g(x) are differentiable (i.e. the derivative exist) then the product is differentiable and, The proof of the Product Rule is shown in the Proof of Various Derivative Formulas section of the Extras chapter.
Inflammation is the most common reason for muscle pain and aches. Any time that major inflammation exists (strep throat, hepatitis, cancer, lupus, acute heart attack, etc.), signs and symptoms often include fevers, sweats, chills, fatigue, weight loss, and various muscle aches, pains and weakness.
Although the broad term lupus usually refers to S.L.E., this is only one type of the illness. There are two other types of lupus: Discoid lupus erythematosus, which mainly affects the skin. The symptoms of this form of lupus include a rash on the face, scalp, or elsewhere.