Q. Given that v=2y4−5, find dyd(4v2−cosy) in terms of only y.Answer:
Express in terms of y: First, we need to express 4v2 in terms of y using the given expression for v.v=2y4−5v2=(2y4−5)24v2=4(2y4−5)2
Find derivative of 4v2: Now, we will find the derivative of 4v2 with respect to y. Using the chain rule, the derivative of 4v2 with respect to y is 2×4v×dydv. Since v=2y4−5, dydv=dyd(2y4−5)=8y3. Therefore, the derivative of 4v2 with respect to y is 4v20.
Simplify derivative expression: Next, we simplify the expression for the derivative of 4v2 with respect to y. 2×4×(2y4−5)×8y3=64y3×(2y4−5)
Find derivative of −cos(y): Now, we find the derivative of −cos(y) with respect to y. The derivative of −cos(y) with respect to y is sin(y).
Combine derivatives: Finally, we combine the derivatives of 4v2 and −cos(y) to find the derivative of the entire expression with respect to y. (dyd)(4v2−cos(y))=64y3∗(2y4−5)+sin(y)
Express final answer: We express the final answer in terms of y.(dyd)(4v2−cos(y))=128y7−320y3+sin(y)
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