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d/dx [|u|]=
u/|u|(u') , u≠0
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d/dx [log a u]=
u'/ln(a)u
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d/dx [sec u]=
(sec u tan u)u'
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d/dx [csc u]=
-(csc u cot u)u'
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d/dx [arcsin u]=
u'/√1-u²
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d/dx [arccos u]=
-u'/√1-u²
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d/dx [arccot u]=
-u'/1-u²
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d/dx [arcsec u]=
u'/|u|√u²-1
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d/dx [arccsc u]=
-u'/|u|√u²-1
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