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.
Take a look at the 10 most common symptoms of lupus. 1. Fatigue. One of the most common early symptoms of lupus is fatigue. If youâre feeling tired all the time, it doesnât necessarily mean you have lupus, however. There are lots of causes of fatigue.