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May
15
revised Solving for $x$ in an equation with a summation symbol
added 13 characters in body
May
15
answered Solving for $x$ in an equation with a summation symbol
May
14
comment Find a formula for $\langle X_n\rangle$ which is defined recursively as follows
See en.wikipedia.org/wiki/Recurrence_relation#Solving
May
14
comment Find $x$ and $y$
@You-know-me, Put $A=8^\circ,24^\circ,72^\circ,216^\circ$ one by one
May
14
answered Time And Distance (Gunshots and Train)
May
14
comment Why is a geometric progression called so?
See, uk.answers.yahoo.com/question/index?qid=20110329104007AAwq7GY and quora.com/Why-is-geometric-progression-called-so
May
14
comment Show that $a_n = 2^n + 3^n .$ Strong Induction for noobs!
See en.wikipedia.org/wiki/Recurrence_relation#Solving
May
14
answered $f(x)= sin(x)^{3}+cos(x)^{3}$ prove ${f}''(x)= \frac{3}{2}(cos(x)+sin(x))(3sin(2x)-2)$
May
14
comment Find $x$ and $y$
@You-know-me, Observe the angles $8,24,72,216:$ Each is three times of the previous
May
14
comment How to prove this logarithm equation?
@TimKrul, See proofwiki.org/wiki/Laws_of_Logarithms
May
14
answered Find $x$ and $y$
May
14
comment How can I prove inequality?
$$\dfrac{x+1+y+2+z+3}3\ge\sqrt[3]{(x+1)(y+2)(z+3)}$$
May
14
answered what is remainder when $(((3!)^{5!})^{7!})^{9!…}$ is divided by 11
May
14
comment Finding the value of a trigonometric equation
@You-know-me, Related : math.stackexchange.com/questions/11246/…, math.stackexchange.com/questions/578286/…
May
14
comment Establishing the Trigonometric Idenitity
Use $$\sin^2\theta+\cos^2\theta=1$$
May
13
comment Extracting real and imaginary numbers from a complex number
@columbus8myhw, Do you mean $n=0$?
May
13
revised How to prove this logarithm equation?
added 92 characters in body
May
13
answered How to prove this logarithm equation?
May
13
comment Extracting real and imaginary numbers from a complex number
@DinRevah, $$\dfrac{x+iy}n=\dfrac xn+i\dfrac yn$$ for $x,y,n$ are real numbers
May
13
answered Evaluating natural limit