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2d
comment perpendicular bisector of AB
@rick, Please share your steps
2d
answered Infinite geometric progression involving square terms
2d
answered Find $\sec \theta + \tan \theta$.
2d
comment Finding the integral of $(x^2+4x)/\sqrt{x^2+2x+2}$
@amWhy, We have $$\int\sqrt{(x+1)^2+1^2}dx+\int\frac{d(x^2+2x+2)}{\sqrt{x^2+2x+2}}-4\int\frac{dx‌​}{\sqrt{(x+1)^2+1^2}}$$
2d
answered Finding the integral of $(x^2+4x)/\sqrt{x^2+2x+2}$
2d
comment If $\frac{5x}{2x^2+5x+1}=\frac13$ then the value of $x+\frac{1}{2x}$ is
@jyothika, Remove the denominator $5/2$ from the LHS
2d
answered If $\frac{5x}{2x^2+5x+1}=\frac13$ then the value of $x+\frac{1}{2x}$ is
2d
comment Naive proof that $\sum_{n=1}^{N-1}\cos(2\pi\frac{n}{N})=-1$
math.stackexchange.com/questions/117114/… and math.stackexchange.com/questions/902175/…
2d
comment Proportionals and squares
We have $\dfrac ba=\dfrac dc\implies ?$
2d
comment Proof for divisibility?
$$k^2-1=(k-2)(k+2)+3$$
2d
comment Sum of Complex series
@Massin, How about this?
2d
answered Sum of Complex series
Aug
26
comment Trigonometric equation $2\sin x+\cos x+1=0$
@user3761304, Take out $\cos\dfrac x2$ as common factor
Aug
26
answered Trigonometric equation $2\sin x+\cos x+1=0$
Aug
26
comment If $\sin( 2 \theta) = \cos( 3)$ and $\theta \leq 90°$, find $\theta$
@burm1, Also find the edited answer
Aug
26
revised If $\sin( 2 \theta) = \cos( 3)$ and $\theta \leq 90°$, find $\theta$
added 319 characters in body
Aug
26
revised How to prove that $53^{103}+ 103^{53}$ is divisible by 39?
added 209 characters in body
Aug
26
answered Simplifying modulus expressions and an unknown expression? discrete math
Aug
26
comment How to prove that $53^{103}+ 103^{53}$ is divisible by 39?
@BillDubuque, The downvote came much before the other answer
Aug
26
answered Range of a trigonometric function