Questions Asked

Ted.knows.it:
Solve the double inequation:
 updated one year ago
 2 replies
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Ted.knows.it:
(image attached) Let P be a point inside the equilateral triangle which has the center in the point O. P_1, P_2 and P_3 are the projections …
 updated one year ago
 17 replies
 1 Medal

Ted.knows.it:
Prove the following inequality:
 updated one year ago
 15 replies
 3 Medals

Ted.knows.it:
If 1/x > 2 and 1/y > 3, prove that 2x + y > 8xy. x,y  belong to R*.
 updated one year ago
 4 replies
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Ted.knows.it:
I have the following integral:
 updated one year ago
 7 replies
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Ted.knows.it:
Let it be the matrix A, with the property:
 updated one year ago
 10 replies
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Ted.knows.it:
Prove the following inequality: equation attached.
 updated one year ago
 23 replies
 2 Medals

Ted.knows.it:
How should I find this determinant? Image attached.
 updated one year ago
 22 replies
 2 Medals

Ted.knows.it:
Three cars are involved in a rally. The probabilities that the cars will finish the race are 3/4, 5/7 and 2/3. What is the probability that …
 updated one year ago
 4 replies
 1 Medal

Ted.knows.it:
Image attached:
 updated one year ago
 10 replies
 1 Medal

Ted.knows.it:
Take the integral:
integral x^2/sqrt(1x^2) dx
For the integrand x^2/sqrt(1x^2), substitute x = sin(u) and dx = cos(u) du. Then sqrt(1…
 updated one year ago
 11 replies
 1 Medal

Ted.knows.it:
lim for x> ∞ from [(x+2)*e^(1/x)]  x = ?
wolfram says it is 1, but when we replace x with ∞ we have ∞  ∞ , indeterminate form, so ho…
 updated one year ago
 11 replies
 1 Medal

Ted.knows.it:
Prove that: (image attached)
…
 updated one year ago
 15 replies
 3 Medals

Ted.knows.it:
Prove that: √e >= 3/2 . Any options for this inequality?
 updated one year ago
 7 replies
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Ted.knows.it:
lim_(n>infinity) (n+1)^(n+1)/((n+1)^(n+1)n^n) = 1 ... this is what wolfram says.. could anyone explain me the steps? .. http://www.wolfram…
 updated 2 years ago
 3 replies
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Ted.knows.it:
lim (1!+2!+3!+...+n!)/(2n)! .. is ok with Stolz–Cesàro theorem? = lim (n+1)!/(2n+2)!(2n)!..
 updated 2 years ago
 2 replies
 1 Medal

Ted.knows.it:
S = 1^2 + 3^2 + 5^2 + ... + (2n1)^2... sum of squared odd numbers. a clue please?
 updated 2 years ago
 6 replies
 2 Medals

Ted.knows.it:
∑(k=1)→n k/(k+1)! .. some help please with this sum..
 updated 2 years ago
 5 replies
 2 Medals

Ted.knows.it:
lim(n→∞)〖(n1)/(n+3)〗= ? .. can't find the way to transform the equation be cause ∞/∞ is impossible...
 updated 2 years ago
 3 replies
 2 Medals

Ted.knows.it:
x√2<= √3... find x.
 updated 2 years ago
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Ted.knows.it:
log_2 (x1) ≤ log_4 (3x) ...
 updated 2 years ago
 6 replies
 1 Medal

Ted.knows.it:
how many solution does this equation have between 0 and 4 pi? : cos(2x)=1/3.. not a fixed value in pi for arccos 1/3....
 updated 2 years ago
 1 reply
 1 Medal