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Aug
16
answered How to solve a limit using L'Hôpital's rule
Aug
16
comment How do I solve ? $\mathop {\lim }\limits_{x \to 0} \frac{{2\cos x}}{{x + 3}}$
$$\frac{2\cos0}{0+3}=?$$
Aug
16
comment Integration of $1/\sin^3 x$
math.stackexchange.com/questions/112918/integrate-csc3x-dx
Aug
16
comment Problems that become easier in a more general form.
The linked Question : math.stackexchange.com/questions/897118/…
Aug
16
comment Using complex solutions in a factorisation
@ChrisCooper, See also : math.stackexchange.com/questions/474507/… and mathworld.wolfram.com/VietasFormulas.html
Aug
16
revised Problem involving Basic Trigonometry
added 623 characters in body
Aug
16
answered Using complex solutions in a factorisation
Aug
16
comment Factorizing Cubic equation into quadratic and linear equation?
Expand to find $$ax^3+bx^2+cx+d=ax^3+(a+d)x^2+(a+d)x+d\implies b=c=a+d$$
Aug
16
comment Where did the negative answer come from?
$$x^2=x+2\implies x=\pm\sqrt{x+2}$$ $$x=-\sqrt{2+x}=-\sqrt{2-\sqrt{-2-\cdots}}$$ $$x=+\sqrt{2+x}=+\sqrt{2+\sqrt{2+\cdots}}$$
Aug
16
answered Problem involving Basic Trigonometry
Aug
16
comment Im trying to find what I got wrong in simplifying
@bie, I think, we should focus on the method. After all, to err is human
Aug
16
answered Im trying to find what I got wrong in simplifying
Aug
16
revised probablity for a fair coin, clarifying on how to use binomial distribution formula
edited body
Aug
16
comment probablity for a fair coin, clarifying on how to use binomial distribution formula
@Kitlai, $$\sum_{k=0}^n\binom nk=(1+1)^n$$ and $$\binom nk=\binom n{n-k}\implies\sum_{k=0}^{49}\binom nk=\sum_{k=51}^{100}\binom nk$$
Aug
16
answered probablity for a fair coin, clarifying on how to use binomial distribution formula
Aug
16
comment How to deal with linear recurrence that it's characteristic polynomial has multiple roots?
@lanse2pty, en.wikipedia.org/wiki/Recurrence_relation#Solving
Aug
16
comment What is the value of $ \sin 10^\circ + \sin 20^\circ + \sin 30^\circ + \ldots + \sin 360^\circ $?
@Dishank, See math.stackexchange.com/questions/17966/… and proofwiki.org/wiki/…
Aug
15
comment Mathematical way to solve integer numbers $217 = (20x+3)r+x$
@Kumar, $\displaystyle(217-x)\cdot20+(20x+3)\cdot1=?$
Aug
15
revised Mathematical way to solve integer numbers $217 = (20x+3)r+x$
added 13 characters in body
Aug
15
comment Mathematical way to solve integer numbers $217 = (20x+3)r+x$
@Kumar, Please don't accept an answer unless fully cleared. If integer $d$ divides integers $a,b;d$ will divide $ax+by$ for integer $x,y$