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jorgeneo560
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bad derivation/integration of trigonometric functions

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Several derivation/integration of trigonometric functions give errors or unsimplify result , try derivate cos(-4x) and then

integrate the result, it gives -4cos(4x) hp prime.jpg

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Maké
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Hi!, @Jorgeneo560 :

You needed configure with CAS.

The result's of derivative and indefinite integral is ...

Differentiate.JPG Integrate_2.JPG 

With Wolfram Alpha, is same ...

Derivative.JPG

Wolfram_3.JPG

Kind Regards !.
Have a nice day !.
@Maké (Technical Advisor Premium - HP Program Top Contributor).
Provost in HP Spanish Public Forum ... https://h30467.www3.hp.com/
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