2-28 part1 Stokes Theorem Half Sphere

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P.2-28 Given a vector function A = a"'3 in (c/J/2). verify Stokes·._ theorem over the surfacl! of a hemi ·pherical bowl of radius 4 and its circular rim.
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In start of the vedio at 0:17 you write dl =Rd(phi) theeta basically this is Rsin theeta d phi you also write here why it become R dphi theeta cap
I later on understand that you put value of theeta bcz at circular rim the angle is π/2 so you put the value of theeta that's why it become R dphi theeta cap but you must include it into your notes bcz it cause confusion to student

abbasamir
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And kindly also make the vedio on how to prove stoke theorem for cone, and for parabollied surface your veido and your notes are really helpfull

abbasamir
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There is mistake in question in dl u write Rd(phi) but this is Rsin (theeta)d(phi) plz you again check it

abbasamir