Q. A curve is defined by the parametric equations x(t)=10t3−5t2+6t and y(t)=−t3. Find dxdy.Answer:
Find Derivative of x: To find the derivative of y with respect to x (dxdy) for a curve defined by parametric equations, we need to find dtdy and dtdx separately and then divide dtdy by dtdx.
Find Derivative of y: First, let's find the derivative of x with respect to t, which is dtdx. Given x(t)=10t3−5t2+6t, we use the power rule for derivatives: dtd(tn)=n⋅t(n−1). dtdx=dtd(10t3)−dtd(5t2)+dtd(6t)=3⋅10t(3−1)−2⋅5t(2−1)+6⋅1t(1−1)=30t2−10t+6
Calculate dxdy: Next, we find the derivative of y with respect to t, which is dtdy. Given y(t)=−t3, we again use the power rule for derivatives. dtdy=dtd(−t3)=−3t3−1=−3t2
Simplify dxdy: Now we have dtdx=30t2−10t+6 and dtdy=−3t2. To find dxdy, we divide dtdy by dtdx. dxdy=dtdxdtdy =30t2−10t+6−3t2
Simplify dxdy: Now we have dtdx=30t2−10t+6 and dtdy=−3t2. To find dxdy, we divide dtdy by dtdx. dxdy=dtdxdtdy =30t2−10t+6−3t2We simplify the expression for dxdy by dividing both the numerator and the denominator by the common term t2, assuming dtdx=30t2−10t+60. dtdx=30t2−10t+61 dtdx=30t2−10t+62
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