Q. If x=t2−1 and y=lnt, what is dx2d2y in terms of t?a)2t4−1b)2t41c)z3−1d)−2e2−1e)2t21
Find dxdy using chain rule: First, we need to find dxdy using the chain rule since y is an integral with respect to t and x is a function of t.dxdy=dtdy⋅dxdt
Derivative of y with respect to t: Given y=∫, the derivative of y with respect to t is 1, so dtdy=1.
Find dxdt: Now, we need to find dxdt. Since x=t2−1, we can rearrange it to t=x+1. Therefore, dxdt=2x+11.
Substitute dxdt into dxdy equation: Substitute dxdt into the dxdy equation.dxdy=1×(2x+11)=2x+11
Find second derivative dx2d2y: Next, we need to find the second derivative, dx2d2y. We'll use the chain rule again, considering that x is a function of t.dx2d2y=dxd(dxdy)
Differentiate dxdy with respect to x: Differentiate dxdy with respect to x.dx2d2y=dxd(2x+11)
Differentiate 2x+11: To differentiate 2x+11, we'll use the derivative of the outer function u1 with respect to u, which is −u21, and then multiply by the derivative of the inner function x+1 with respect to x. dx2d2y=−4(x+1)1⋅2x+11
Simplify the expression: Simplify the expression. dx2d2y=−4(x+1)(2x+1)1
Substitute x back into the equation: Since x=t2−1, substitute x back into the equation.dx2d2y=−4(t2)(2t)1
Simplify the expression further: Simplify the expression further. dx2d2y=−8t31
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