Calc 3 Test 1 Things to Remember

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28 Terms

1

Circular Cylinder

x² + y² = c

<p>x² + y² = c</p>
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2

Parabola

z = c - y²

<p>z = c - y²</p>
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3

Ellipsoid

x²/a² + y²/b² + z²/c² = k

<p>x²/a² + y²/b² + z²/c² = k</p>
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4

Hyperbolic Cylinder

x²/a² + y²/b² = -1

<p>x²/a² + y²/b² = -1</p>
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5

One Sheeted Hyperboloid

x² + y² - z² = 1

<p>x² + y² - z² = 1</p>
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6

Two Sheeted Hyperboloid

z² - x² - y² = 1

<p>z² - x² - y² = 1</p>
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7

Elliptic Parabaloid

z = x² + y²

<p>z = x² + y²</p>
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8

Hyperbolic Parabaloid

z = x² - y² (“saddle”)

<p>z = x² - y² (“saddle”)</p>
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9

Cone

z² = x² + y²

<p>z² = x² + y²</p>
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10

dy/dx for a parametric curve <x(t),y(t)>

dy/dt ÷ dx/dt

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11

d²y/dx² for a parametric curve <x(t),y(t)>

d/dt(dy/dx) ÷ dx/dt

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12

integral from a to b of a parametric curve <x(t),y(t)>

integral from ta to tb of [y(t)x’(t)dt]

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13

arclength for a parametric curve <x(t),y(t)>

integral from ta to tb of sqrt(x’(t)²+y’(t)²)

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14

(dot product) a•b = ….

|a||b|cosθ

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15

Unit tangent vector T(t)

r’(t)/|r’(t)|

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16

Unit normal vector N(t)

T’(t)/|T’(t)|

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17

Unit binormal vector B(t)

T x N

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18

scalar projection of b onto a

(a • b)/|a|

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19

vector projection of b onto a

(a • b)/|a| * a/|a|

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20

sin2t (double angle identity)

2sintcost

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21

cos2t (double angle identites)

2cos²tsin²t, 1 - 2sin²t, 2cos²t - 1

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22

sin(x ± y)

sin(x)cos(y) ± cos(x)sin(y)

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23

cos(x ± y)

cos(x)cos(y) ± sin(x)sin(y)

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24

equation for a plane (given normal vector <a,b,c> and point (x0,y0,z0))

a(x−x0)+b(y−y0)+c(z−z0)=0

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25

area of parallelogram formed by two vectors (double area of the triangle)

|PQ x PR|

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26

|AxB| =

|A||B|sinx

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27

direction vector for line of intersection between two planes

a = n1 x n2

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28

Formula for distance from a point to the plane

D = (ax1 + by1 + cz1)/sqrt(a²+b²+c²)

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