Q. Given that u=3v4+1, find dvd(u2−cosv) in terms of only v.Answer:
Express in terms of v: First, we need to express u2−cos(v) in terms of v using the given expression for u. u=3v4+1 u2=(3v4+1)2 Now, we have u2−cos(v)=(3v4+1)2−cos(v)
Find derivative of u2: Next, we will find the derivative of u2 with respect to v. To do this, we will use the chain rule, which states that the derivative of a composite function is the derivative of the outer function evaluated at the inner function times the derivative of the inner function.Let's denote f(v)=u2 and g(v)=3v4+1. Then f(g(v))=(3v4+1)2.Using the chain rule, we get:dvd(u2)=dud(u2)⋅dvd(u)=2u⋅dvd(3v4+1)=2u⋅(12v3)=24v3⋅u
Find derivative of −cos(v): Now, we need to find the derivative of −cos(v) with respect to v.dvd(−cos(v))=sin(v)
Combine derivatives: We can now combine the derivatives to find the derivative of the entire expression u2−cos(v) with respect to v. dvd(u2−cos(v))=dvd(u2)+dvd(−cos(v)) = 24v3⋅u+sin(v)
Substitute back into expression: Finally, we substitute u back into the expression in terms of v. u=3v4+1 dvd(u2−cos(v))=24v3×(3v4+1)+sin(v) =72v7+24v3+sin(v)
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