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dℓ =
sqrt(dx² +dy²)
for curve C defined by y = f(x), a<= x <=b then
dℓ = sqrt(dx²)sqrt(1+(dy/dx)²)
for curve C defined by y = f(x), a<= x <=b then (SIMPLIFIED)
ℓ = int (bounds a, b)(sqrt(1+(f’(x))²)dx)
for curve C defined by x = g(y), c<= x <=d then
dℓ = sqrt(dy²)sqrt(1+(dx/dy)²)
for curve C defined by x = g(y), c<= x <=d then (SIMPLIFIED)
ℓ = int (bounds c, d)(sqrt(1+(g’(y))²)dy)