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.
The most common type, systemic lupus erythematosus, affects many parts of the body. Other types of lupus are: 1  Discoid lupus erythematosusâcauses a skin rash that doesn't go away. 2  Subacute cutaneous lupus erythematosusâcauses skin sores on parts of the body exposed to sun.he most common type, systemic lupus erythematosus, affects many parts of the body. Other types of lupus are: 1  Discoid lupus erythematosusâcauses a skin rash that doesn't go away. 2  Subacute cutaneous lupus erythematosusâcauses skin sores on parts of the body exposed to sun.