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Dec
14
answered Identity of sum of binomial coefficients
Dec
14
answered Determining the last two digits of $229^{10} +37^{10}$
Dec
14
answered Integration of $1/(x\sqrt{25x^2-1})$
Dec
13
answered How do I prove this seemingly simple trigonometric identity
Dec
13
comment How to evaluate $\int_0^1 \frac{2-t}{t^2-t+1} dt$?
@ADG, That could safely be a request via comment.
Dec
13
comment How to evaluate $\int_0^1 \frac{2-t}{t^2-t+1} dt$?
@ADG, Why have you copied my other answer into this?
Dec
13
comment How to evaluate $\int_0^1 \frac{2-t}{t^2-t+1} dt$?
@AlonAlon, See en.wikipedia.org/wiki/Trigonometric_substitution and sosmath.com/calculus/integration/trigsub/trigsub.html
Dec
13
answered How to evaluate $\int_0^1 \frac{2-t}{t^2-t+1} dt$?
Dec
13
answered How to find $x$ in $\left\lfloor{\frac{x-2000}{4}}\right\rfloor+x\equiv0\pmod 7$
Dec
13
comment To prove $(\sin\theta + \csc\theta)^2 + (\cos\theta +\sec\theta)^2 \ge 9$
@DarthGeek, To make things more explicit
Dec
13
revised To prove $(\sin\theta + \csc\theta)^2 + (\cos\theta +\sec\theta)^2 \ge 9$
added 143 characters in body
Dec
13
answered To prove $(\sin\theta + \csc\theta)^2 + (\cos\theta +\sec\theta)^2 \ge 9$
Dec
13
comment Two conjectures regarding $\varphi(n)$
See also : math.stackexchange.com/questions/173908/…
Dec
13
comment In a triangle ABC , $a\cos(B-C)+b\cos(C-A)+c\cos(A-B)$ is equal to…
@DheerajKumar, See $2\sin A\cos B$ formula mathworld.wolfram.com/WernerFormulas.html
Dec
13
answered In a triangle ABC , $a\cos(B-C)+b\cos(C-A)+c\cos(A-B)$ is equal to…
Dec
13
comment How to calculate the following integral $\int\frac{dx}{1-\cos(a)\cos(x)}$
Use en.wikipedia.org/wiki/Tangent_half-angle_substitution
Dec
12
answered Finding the equation of a circle given one point and radius
Dec
12
answered argument of the complex number $1-\cos x-i\sin x$
Dec
12
answered Solving system when terms have both variables
Dec
12
answered Inequality proof using real numbers