Exam 10: Conics and Calculus

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Find the arc length of the curve on the given interval. x=t2,y=8t,0t4x = t ^ { 2 } , y = 8 t , 0 \leq t \leq 4

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D

Determine the t intervals on which the curve x=7t2,y=lnt is concave downward x = 7 t ^ { 2 } , y = \ln t \text { is concave downward } or concave upward.

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E

Identify the graph for the polar equation r=52+cosθr = \frac { 5 } { 2 + \cos \theta }

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C

Use the result, "the set of parametric equations for the line passing through (x1,y1)\left( x _ { 1 } , y _ { 1 } \right) and (x2,y2)\left( x _ { 2 } , y _ { 2 } \right) is x=x1+t(x2x1),y=y1+t(y2y1)nx = x _ { 1 } + t \left( x _ { 2 } - x _ { 1 } \right) , y = y _ { 1 } + t \left( y _ { 2 } - y _ { 1 } \right) ^ { n } to find a set of parametric equations for the line passing through (0,0)( 0,0 ) and (9,8)( 9 , - 8 ) .

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 Find dydx\text { Find } \frac { d y } { d x } \text {. } x=7eθx = 7 e ^ { \theta } y=eθ7y = e ^ { - \frac { \theta } { 7 } }

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Classify the graph of the equation as a circle, a parabola, an ellipse, or a hyperbola. 7x2+10y2+7x+4y5=07 x ^ { 2 } + 10 y ^ { 2 } + 7 x + 4 y - 5 = 0

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Find the area of the inner loop of r=3+6sinθr = 3 + 6 \sin \theta

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Find the directrix of the parabola given by y244y484x=0y ^ { 2 } - 44 y - 484 x = 0

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 Find dydx\text { Find } \frac { d y } { d x } x=7eθx = 7 e ^ { \theta } y=eθ7y = e ^ { - \frac { \theta } { 7 } }

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 Find the area of one petal of r=13cos3θ\text { Find the area of one petal of } r = 13 \cos 3 \theta \text {. }

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Find the eccentricity and distance from the pole to the directrix of the conic. Then sketch and identify the graph. Use a graphing utility to confirm your results. r=23+cosθr = \frac { 2 } { 3 + \cos \theta }

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 Identify the conic for the polar equation r=2e1+ecosθ when e=1.8\text { Identify the conic for the polar equation } r = \frac { 2 e } { 1 + e \cos \theta } \text { when } e = 1.8 \text {. }

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Find a set of parametric equations for the rectangular equation y=3x5y = 3 x - 5

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 Identify the graph for the polar equation r=61cosθ\text { Identify the graph for the polar equation } r = \frac { 6 } { 1 - \cos \theta } \text {. }

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 Identify any points at which the cycloid x=θ+sinθ,y=1cosθ is not smooth. \text { Identify any points at which the cycloid } x = \theta + \sin \theta , y = 1 - \cos \theta \text { is not smooth. }

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Find an equation of the tangent line at a point (0,0) on the curve ( 0,0 ) \text { on the curve } x=t24,y=t22tx = t ^ { 2 } - 4 , y = t ^ { 2 } - 2 t

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Sketch the curve represented by the parametric equations, and write the corresponding rectangular equation by eliminating the parameter. x=tx = t y=lnty = \ln t

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Find a polar equation for the ellipse with its focus at the pole, eccentricity e=56, and e = \frac { 5 } { 6 } , \text { and } directrix y=10y = - 10 .

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Find the eccentricity and distance from the pole to the directrix of the conic. Then sketch and identify the graph. Use a graphing utility to confirm your results. r=27+5sinθr = \frac { 2 } { 7 + 5 \sin \theta }

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 Find dydx\text { Find } \frac { d y } { d x } \text {. } x= y=10-10t

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