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How do you find the fourth derivative of #cos x#?

1 Answer

Jan 4, 2017

#cosx#

#d/(dx)cosx=-sinx#

#d/(dx)(-sinx)=-cosx#

#d/(dx)(-cosx)=sinx#

#d/(dx)(sinx)=cosx#

The fourth derivative of #cosx# is #cosx#.

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