# Solution 66: sec(sum(csc(tan(cot(sin(cos(...)))))))

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- Published on Nov 15, 2018
- Let's telescope our way through the odd functions.

Congratulations to Jaleb, Kevin Tong, Hiren Bavaskar, reynolds45, Bigg Barbarian, Rohit Agarwal, Aswini Banerjee, Ricardo Mogollon, Albanovaphi7, and aby p for successfully solving this math challenge question! Jaleb was the first person to solve the question.

Your support is truly a huge encouragement.

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Welcome, everyone! My channel hosts one weekly math challenge question per week (made by either myself, my family, or my friends), which will be posted every Wednesday. Please comment your proposed answer and explanation below! If you are among the first ten people with the correct answer, you will be recognized in the next math challenge video. The solution to this question and new question will be posted next Wednesday.

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Pathagas3 months agoI love this haha

It's the THUG3 months ago^{+1}Jaleb is illuminati

Sven Cats5 months ago^{+1}Awesome video! This problem looks even a bit nicer in 2019, as you can go from 0 to 2019 and replace the 5 by a 1

Yerram Varun9 months agoBeautifully done!

Nicholas Leclerc9 months ago^{+1}You should reveal the answers of some commenters AFTER the whole video, to avoid spoilers !!!

Nick10 months ago^{+2}Hi, I have a problem for you.

find:

limit of the integral of ((n^c)(e^-((x^2)(n^2)))dx) from 0 to c as n approaches infinity such that c is a constant and c>1.

Does the function inside converges?

Harshit Gupta10 months ago^{+2}good video.....now solve......integral limit( minus one to zero) ((x)^(4)-2x^(2))^(1/3)+√(1-√(x^(3)+1))

柯仲遠10 months ago^{+1}幹 太強了

Facebotter10 months ago^{+5}Do you solve these while making the video or beforehand?

Facebotter10 months ago^{+2}@LetsSolveMathProblems I love the sense of spontaneity! Presupposing the audiences questions and confusions is really cool :)

LetsSolveMathProblems10 months ago^{+7}I always have at least one complete solution prepared for every weekly math challenge question before the problem is posted. In general, I spend around thirty minutes to a few hours of preparation time prior to actually filming a video

Saroj si10 months ago^{+2}nice Sir many many thanks to you

Infested Terran10 months agohmmmmmm

Math 123410 months agoPlease can you explain fractional derivatives and fractional integral step by step

Math 123410 months agoNo I mean one half derivatives of any functions ......in general l mean m/n derivatives or integral of any functions

Monster Azice10 months agoMath 1234 you mean partial derivatives and integration by parts?

Moslema Sultana10 months ago^{+2}what the heck! I saw 1 to 2018! 😭😭😭

Linus Schwan10 months ago^{+21}Great video, I always enjoy these cool problems. Just one suggestion: Maybe you could show the first comment with the right answer at the end of the video or just show their name at the start. That way the answer won't get spoiled so early, which in my opinion would make the video more interesting to watch.

Linus Schwan10 months ago@LetsSolveMathProblems You're very welcome!

LetsSolveMathProblems10 months ago^{+4}That is an excellent suggestion. In the next solution video, I will just reveal the name of the comment at the beginning and see if there are any downsides of doing so. If there are no viewers criticizing the new format (with a well founded reason), I will make the implementation permanent. Thank you so much for your helpful suggestion! =)

SUPRATIM SANTRA10 months ago^{+4}Sir please upload such... Interesting problem more..

Aliasger Anees10 months ago^{+3}Best question to apply even and odd function concept.

Ojas sevekar10 months ago^{+3}Amazing telescopic

DrWaffles10 months ago^{+33}You did all of that to get sec(0). I appreciate the effort

Colin Pountney10 months agoDrWaffles n