how to solve this integral dt/(cost)^3 ?
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Originally Posted by transgalactic how to solve this integral dt/(cost)^3 ? See here: integrate 1/(Cos[x])^3 - Wolfram|Alpha Click on Show steps. The reduction formula can be found using integration by parts.
how to solve it by parts?? what parts ?
Originally Posted by transgalactic how to solve it by parts?? what parts ? Use Google: Integration by parts. (But surely you have been taught the technique ....?!)
yes i hav been taught but i cant see how to apply it here so it will be effective
Originally Posted by transgalactic yes i hav been taught but i cant see how to apply it here so it will be effective Have you even tried ....? u = sec(x) => du = .... dv = sec^2(x) dx => v = ...... You get I = ..... + int( ......) dx = ....... - I + int sec(x) dx => first step from Wolframalpha. All the .....'s are things you need to fill in.
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