Integrals: Trig Substitution 3 (long problem)
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OHMAGAD I GET IT NOW! a week in university = 18 minutes on youtube.
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@NOMVrewq It stays positive. You only add a plus minus sign when you get rid of the square root sign.
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Great video! I just have 2 questions. Should the «2» become a «+ or - 2» when you pull it out from the square root at 3:35? Does it even matter?
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This will solve ur problem:
(en(dot0wikipedia(dot)org/wiki
/Trigonometric_substitution#Su bstitutions_that_eliminate_tri gonometric_functions) -
Thank you for your video! I have a few questions :)
how do you decide to set ((x-3)/2)^2 equal to sin^2 theta?
Can't it also equal to cos^2theta? b/c 1-cos^2theta= sin^2theta and 1-sin^2theta=cos^2theta. and you are simply substituting sin^2theta or cos^2theta in the formula 1-u^2?
Thank you Prof Khan!
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i seriously had a headache from following this...
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nice. i had the same problem. the only difference is that mine is a definite integral. SMH. -_-
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you forgot + C at the end
abdy1345 2 years ago 67
applause
taurus50592 2 years ago 24