integral indefinida de Cos(3x)dx/Sen(3x)
[tex] \sin( \sqrt{x} ) \div 2 \sqrt{x} [/tex]
[tex]integral \: de \: \: 8 {x}^{3} \tan(2 {x}^{4} ) dx[/tex]
[tex] \sec ^{2} (8 {x}) dx \div 4 + \tan(8x) [/tex]

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