This Calculus 3 video explains how to evaluate double integrals and iterated integrals. Examples include changing the order of integration as well as integrating with u-substitution.
Lines & Planes - Intersection: https://www.youtube.com/watch?v=_W3aVWsMp14
Angle Between Two Planes:
https://www.youtube.com/watch?v=7G07dPSlWbY
Distance Between Point and Plane:
https://www.youtube.com/watch?v=zWMTTRJ0l4w
Chain Rule - Partial Derivatives:
https://www.youtube.com/watch?v=XipB_uEexF0
Implicit Partial Differentiation:
https://www.youtube.com/watch?v=OBELQIPH5xY
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Directional Derivatives:
https://www.youtube.com/watch?v=CnVes9TdnPo
Limits of Multivariable Functions:
https://www.youtube.com/watch?v=E1lMMBpz8YM
Double Integrals:
https://www.youtube.com/watch?v=BJ_0FURo9RE
Local Extrema & Critical Points:
https://www.youtube.com/watch?v=UID893EosM8
Absolute Extrema - Max & Min:
https://www.youtube.com/watch?v=Hg38kfK5w4E
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Lagrange Multipliers:
https://www.youtube.com/watch?v=5-CUqogfPLY
Triple Integrals:
https://www.youtube.com/watch?v=7iy83x8bv6o
2nd Order - Differential Equations:
https://www.youtube.com/watch?v=uI2xt8nTOlQ
Undetermined Coefficients:
https://www.youtube.com/watch?v=P3fc6v191mA
Variation of Parameters:
https://www.youtube.com/watch?v=Ik3YW1JGr_A
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