User mathamphetamines

11 votes

Accepted

Is it true that $2^n-1$ is prime whenever $n$ is prime?

answered Feb 22, 2015 at 21:18

4 votes

Find $\int\frac1x\sqrt\frac{1-x}{1+x}\ dx$

answered Dec 30, 2014 at 4:34

3 votes

How to integrate $\int_0^x \frac{1+\epsilon X}{1-X}~dX$?

answered Dec 13, 2014 at 3:16

3 votes

Divisibility by a prime number p.

answered Feb 19, 2015 at 6:10

3 votes

Solution for the integral $∫ \sin(4x)(1+\cos(4x))\mathrm dx$

answered Mar 31, 2017 at 18:16

3 votes

Accepted

Can this differentiation be simplified?

answered May 12, 2016 at 4:40

2 votes

Accepted

Setting up this polar equation?

answered Mar 31, 2017 at 16:28

2 votes

Limit of log functions

answered Mar 16, 2015 at 7:28

2 votes

Accepted

Double integral with two parameters $\int_{x_1=1}^{x_2=2}\int_{y_1=0}^{y_2=x}\arctan\left(\frac{y}{x}\right)\,dx\,dy$

answered Dec 17, 2014 at 1:26

2 votes

Accepted

critical numbers of a complex function $ f(x) = 2 x - 5 x^{\frac{2}{5}} $

answered Mar 20, 2015 at 3:07

2 votes

Problem in trigonometry integral

answered Mar 21, 2015 at 5:53

1 vote

Accepted

Division of complex numbers when to use what sign

answered Dec 9, 2014 at 5:48

1 vote

Solve for $y' + Py = ae^{bt}$

answered Jan 30, 2015 at 4:01

1 vote

The exact value of csc -420 degrees (Find the exact value of each trigonometric funtion)

answered Dec 19, 2014 at 4:25

1 vote

Calculate the solution of the differential equation

answered Dec 4, 2014 at 23:56

1 vote

Variables, Square roots, and exponents

answered Dec 6, 2014 at 5:09

1 vote

Solving $x^2 (x-y)^2 = x^2 - y^2$ using implicit differentiation

answered Mar 20, 2015 at 2:23

1 vote

Find angle using the sine and cosine formulas

answered Apr 9, 2016 at 7:13

1 vote

Find the value of $\sin (x)$ if $\cos(x)=\frac 1 3$

answered Apr 17, 2017 at 17:23

1 vote

Accepted

Find the coordinates of the inflexion points of $A(\beta)=8\pi-16\sin(2\beta)$ in $\mathbb{R}$

answered May 1, 2017 at 17:04

0 votes

Find the equation of the line tangent to the curve $y=\tan(\pi x/4)$ at (1,1)

answered May 1, 2017 at 18:17

0 votes

Accepted

Definite Integral - help with choosing which solution is the right one?

answered Dec 8, 2014 at 7:16

0 votes

Evaluating definite integral

answered Nov 6, 2014 at 7:18

0 votes

Integration question does this substitution work?

answered Nov 7, 2014 at 2:52

0 votes

Proving the convergence/divergence of a seemingly oscillating series

answered Nov 18, 2014 at 9:05

0 votes

ODE ‎Phase portraits of 2x2 systems.‎

answered Nov 21, 2014 at 6:12

0 votes

evaluate integral with fractional exponents

answered Jan 6, 2015 at 7:17

0 votes

Need help in clarifying relation of square root and logarithm to do a correct substitution

answered Jan 27, 2015 at 5:17

0 votes

If $ f(x) + x^4[f(x)]^3 = 12$ and $f(2) = 2$, find $f′(2)$.

answered Mar 27, 2015 at 4:45

0 votes

$(1\ 3\ 5\ 4)(2\ 6)$ is both even and odd, how is this possible?

answered Dec 21, 2015 at 7:02

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31 Answers

Is it true that $2^n-1$ is prime whenever $n$ is prime?

Find $\int\frac1x\sqrt\frac{1-x}{1+x}\ dx$

How to integrate $\int_0^x \frac{1+\epsilon X}{1-X}~dX$?

Divisibility by a prime number p.

Solution for the integral $∫ \sin(4x)(1+\cos(4x))\mathrm dx$

Can this differentiation be simplified?

Setting up this polar equation?

Limit of log functions

Double integral with two parameters $\int_{x_1=1}^{x_2=2}\int_{y_1=0}^{y_2=x}\arctan\left(\frac{y}{x}\right)\,dx\,dy$

critical numbers of a complex function $ f(x) = 2 x - 5 x^{\frac{2}{5}} $

Problem in trigonometry integral

Division of complex numbers when to use what sign

Solve for $y' + Py = ae^{bt}$

The exact value of csc -420 degrees (Find the exact value of each trigonometric funtion)

Calculate the solution of the differential equation

Variables, Square roots, and exponents

Solving $x^2 (x-y)^2 = x^2 - y^2$ using implicit differentiation

Find angle using the sine and cosine formulas

Find the value of $\sin (x)$ if $\cos(x)=\frac 1 3$

Find the coordinates of the inflexion points of $A(\beta)=8\pi-16\sin(2\beta)$ in $\mathbb{R}$

Find the equation of the line tangent to the curve $y=\tan(\pi x/4)$ at (1,1)

Definite Integral - help with choosing which solution is the right one?

Evaluating definite integral

Integration question does this substitution work?

Proving the convergence/divergence of a seemingly oscillating series

ODE ‎Phase portraits of 2x2 systems.‎

evaluate integral with fractional exponents

Need help in clarifying relation of square root and logarithm to do a correct substitution

If $ f(x) + x^4[f(x)]^3 = 12$ and $f(2) = 2$, find $f′(2)$.

$(1\ 3\ 5\ 4)(2\ 6)$ is both even and odd, how is this possible?