Isn't that just a u sub. Let u = tanxint(e^tanx)/cos^2(x)
Isn't that just a u sub. Let u = tanxint(e^tanx)/cos^2(x)
Anyone has guessed the substitution?This one should be harder.
I think I've masked the underlying substitution quite well.
I can reduce it but I can't evaluate it. Are you sure this integral is expressible in terms of elementary functions?Anyone has guessed the substitution?
tried this as my initial thought (i knew getting rid of the denominator was a necessary step), didn't get very far for some reason, maybe i made an arithmetical error somewhereOnce the substitution is uncovered, it is not much fun.
This one should be easier.
Not sure if this is still active but I'll give this a go for fun (let me know if I've made any mistakes or there is an easier way). The x-ints area new one...shouldn't be too hard
Feel free to share your attempt.
Find the area bounded by x-axis and the curve
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Not quite sure where I missed the half, but I might not have checked it properly.Your approach is correct but unfortunately a factor of 1/2 is missing somewhere.
I believe the factor of a half comes from the identity you (incorrectly) quoted. The identity should be:Not quite sure where I missed the half, but I might not have checked it properly.
Using the identity:another one
Feel free to share your attempt.
This is the product of two functions. You cannot substitute and multiply this way.
Wow that was a long one, unfortunately didn't get it out as I'm off by a bit, can anyone see my error?