Q. Given that y=3u2+4, find dud(2u5−4siny) in terms of only u.Answer:
Identify Function: Identify the function that needs to be differentiated and the function y in terms of u.
Differentiate Power Rule: Differentiate the function 2u5 with respect to u using the power rule, which states that dud[un]=n⋅u(n−1).Calculation: dud[2u5]=2⋅5⋅u(5−1)=10u4
Apply Chain Rule: Recognize that y is a function of u, so when differentiating −4sin(y) with respect to u, we need to use the chain rule. The chain rule states that dud[f(g(u))]=f′(g(u))⋅g′(u).
Differentiate y=3u2+4: Differentiate y=3u2+4 with respect to u to find dudy.Calculation: dudy=dud[3u2+4]=6u
Apply Chain Rule: Apply the chain rule to differentiate −4sin(y) with respect to u.Calculation: dud[−4sin(y)]=−4cos(y)⋅dudy=−4cos(y)⋅6u=−24ucos(y)
Substitute y=3u2+4: Substitute y=3u2+4 into the expression −24ucos(y) to express it in terms of u.Calculation: −24ucos(3u2+4)
Combine Derivatives: Combine the derivatives of 2u5 and −4sin(y) to get the final derivative in terms of u.Calculation: dud[2u5−4sin(y)]=10u4−24ucos(3u2+4)
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