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I was born to answer lhfs.


2d
answered Without actually calculating the value of cubes find the value of $(1)^3+(2)^3+2(4)^3+(-5)^3+(-6)^3$. Also write the identity used
Sep
30
awarded  Explainer
Sep
28
reviewed Edit suggested edit on Are there any nonzero integers $a$ , $b$ such that $a^2$ = $3b^2$
Sep
28
revised Are there any nonzero integers $a$ , $b$ such that $a^2$ = $3b^2$
non-latexed to latex
Sep
20
answered How do I factor $z^4+2z^3+4z^2+2z+3$?
Aug
31
comment Find the sum, if exists $\sum\limits_{n=1}^{\infty} \frac{(2n)!}{2^{2n}(n!)^2(n+1)}$
I'd just stick to Shubham's method.
Aug
31
revised Finding the value of $\frac{\cos^4\beta}{\cos^2\alpha} + \frac{\sin^4\beta}{\sin^2\alpha}$.
added 35 characters in body
Aug
31
revised Finding the value of $\frac{\cos^4\beta}{\cos^2\alpha} + \frac{\sin^4\beta}{\sin^2\alpha}$.
added clarity
Aug
31
revised Finding the value of $\frac{\cos^4\beta}{\cos^2\alpha} + \frac{\sin^4\beta}{\sin^2\alpha}$.
edited title
Aug
31
answered Finding the value of $\frac{\cos^4\beta}{\cos^2\alpha} + \frac{\sin^4\beta}{\sin^2\alpha}$.
Aug
30
revised Adding $2$ absolute values together: $|x+2| + |x-3| =5.$
deleted 3 characters in body
Aug
30
answered Adding $2$ absolute values together: $|x+2| + |x-3| =5.$
Aug
2
comment What are some good questions for this trick, if $\frac{a}{b}=\frac{c}{d}=\frac{e}{f}=\dots=\alpha$ then $\alpha=\frac{a+c+e+…}{b+d+f+…}$?
Do you happen to have a copy of Higher Algebra by Hall and Knight? It contains quite a few of these in the first chapter.
Jul
2
awarded  Curious
Jun
26
comment Trigonometry / Finding the exact value
Do you understand that that the cosine function obtains the same value every $2\pi$?
Jun
24
answered Problem of quadratic equation
Jun
24
awarded  Yearling
Jun
20
awarded  Nice Answer
Jun
5
comment How do you solve this using only given values, logarithm rules and no calculator?
You can introduce $\log(2)$ easily. $\log(4) = 2\log(2)= 0.6021 $.
Jun
3
revised How do I prove $\frac{ \sqrt{x+h}-\sqrt{x} }{ h}=\frac{1}{\sqrt{x+h}+\sqrt{x}}$?
edited tags