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1h
comment Find the equation of the circle.
@lnuyaki, $(5,5)$ will be midpoint of $(1,2)$ and the other center, right?
2h
comment Find the equation of the circle.
@Lulu, Google to find the condition
2h
comment Find the equation of the circle.
@Lulu, Have you understood my method?
2h
comment Find the equation of the circle.
@Lulu, What are $P_1,P_2,P_3$?
2h
comment how can i prove this trigonometry equation
@lau, See mathworld.wolfram.com/ProsthaphaeresisFormulas.html
2h
answered Limit to infinity with natural logarithms
2h
answered Find the equation of the circle.
2h
answered Question on Quadratic Equations.11
23h
comment New Idea to prove $1+2x+3x^2+\cdots=(1-x)^{-2}$
@Khosrotash, Please pinpoint your confusion.
23h
comment AMT - Three whole numbers add up to 149 and multiply to give 987. What is the largest of the three number
Check with combinations $1,3,7,21,47,141,329,987<149$ to get $$1,7,141$$
1d
comment Why in order to have the greatest term in the expansion of$ (1 + x)^n$, $x$ can't be greater than unity?
See math.stackexchange.com/questions/722952/…
1d
answered New Idea to prove $1+2x+3x^2+\cdots=(1-x)^{-2}$
1d
answered Modular Quadratic Equation
1d
comment Need Help: Exponential Equations (Same bases)
$$=3^{n+1}[3+3^2-1]=?$$
2d
comment Trig identity involving sum of cosines
See mathworld.wolfram.com/ProsthaphaeresisFormulas.html
2d
revised Prove an equality
edited body
2d
revised Prove an equality
deleted 9 characters in body
2d
comment Prove an equality
@Nash, If $a+b+c=0a^2+b^2-c^2+2ab=0\implies \sum a^4-\sum2b^2c^2=0$
2d
answered Prove an equality
2d
comment Integer solutions to $\frac{1}{a} + \frac{1}{b} = \frac{1}{12}$.
Related : math.stackexchange.com/questions/1375041/…