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Oct
16
revised Find the value of X when X is positive intigers.
added 99 characters in body
Oct
16
answered Find the value of X when X is positive intigers.
Oct
16
answered the derivative of cos(2x) with the double-angle formula?
Oct
16
comment Simple limit problem
@Ethan,mathworld.wolfram.com/ProsthaphaeresisFormulas.html
Oct
16
comment Solving recurrence equations with repeated substitution?
Related : math.stackexchange.com/questions/975064/…
Oct
16
answered Sum of roots of an equation $\sqrt{x-1}+\sqrt{2x-1}=x$
Oct
16
awarded  Enlightened
Oct
16
awarded  Nice Answer
Oct
15
comment Proving $n^4 - n$ is not divisible by 4 for an infinite number of $n$.
@Galc127, In fact, $(n,n-1)=1$
Oct
15
answered Proving $n^4 - n$ is not divisible by 4 for an infinite number of $n$.
Oct
15
comment Remainder Theorem, solve for K
en.wikipedia.org/wiki/Polynomial_remainder_theorem
Oct
15
answered This recurrence relation will evaluate to?
Oct
15
answered Proof By Induction? (Need help!)
Oct
15
answered The smallest $n$ for which the sum of binomial coefficients exceeds $31$
Oct
15
comment Finding the remainder given another dividend, divisor, and remainder
@user184477, Please go through the link in the answer. $9\%7=2$
Oct
15
comment Finding the remainder given another dividend, divisor, and remainder
@user184477, $k=7a+3,3k=21a+9\equiv2\pmod7,$ right?
Oct
15
answered Finding the remainder given another dividend, divisor, and remainder
Oct
14
comment Prove that, given any positive integer n, some multiple of it must be of the form 99…900…0
math.stackexchange.com/questions/164986/…
Oct
14
comment What is the number of digits of this number: $2^{333111160}$?
Related : math.stackexchange.com/questions/177973/…
Oct
14
comment Simplify this fraction with square roots; application to arctangent equation.
@vev78, Be careful for $\arctan$ addition. See math.stackexchange.com/questions/138310/… and en.wikipedia.org/wiki/…