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Homework Statement
∫ -60x3tan(3x4)dx
Homework Equations
integration rules
The Attempt at a Solution
=> ∫ -60x3tan(3x4)dx
=> u = (3x4)
=> du = 12x3dx
=> (-5)∫ (1/5)-60x3tan(3x4)dx
=> -5 ∫ tan u
=> -5 .-ln cos(u) , where u = (3x4)
=> 5 . ln cos (3x4)
I am using this integral to check an original equation which I differentiated which was:
ln (cos5(3x4) , so where have I gone wrong when integrating, because I'm not getting it back ? ( I have started just learning the basics of integration so be nice :) )
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