User minthao_2011

21 votes

How to prove $\cos \frac{2\pi }{5}=\frac{-1+\sqrt{5}}{4}$?

answered Sep 26, 2012 at 15:54

7 votes

$\int \frac{\sin^3x}{\sin^3x + \cos^3x)}$?

answered Oct 28, 2012 at 14:52

7 votes

Find if three points in 3-dimensional space are collinear

answered Oct 7, 2012 at 7:26

4 votes

Finding the Extrema of a Function (without differetiation)

answered Sep 28, 2012 at 0:13

4 votes

Solving an equation with three quadratic radicals in the set of real numbers

answered Sep 24, 2012 at 9:23

4 votes

How can I find the integral?

answered May 28, 2014 at 3:28

3 votes

Solving $ \sin x + \sqrt 3 \cos x = 1 $ - is my solution correct?

answered Sep 24, 2012 at 9:20

2 votes

Prove $3(\sin x-\cos x)^4 + 6(\sin x+ \cos x)^2 + 4(\sin^6 x + \cos^6 x) -13 = 0$

answered Sep 6, 2014 at 14:52

2 votes

Solve $3\log_{10}(x-15) = \left(\frac{1}{4}\right)^x$

answered Oct 11, 2012 at 1:49

2 votes

Line parallel to plane but not on the plane?

answered Oct 16, 2012 at 14:44

2 votes

How to solve this trigonometric equation?

answered Oct 22, 2012 at 5:06

2 votes

How to solve this irrational equation?

answered Mar 4, 2013 at 3:06

2 votes

Accepted

How can I solve this nice rational equation

answered Jun 30, 2016 at 2:27

1 vote

Complex numbers equation: $z^4 = -16$

answered Dec 29, 2015 at 12:40

1 vote

Accepted

Solve this equation: $7x^3+11x^2+6x+2=(x+2)\sqrt[3]{x^3+3x^2+5x+1}$

answered May 3, 2015 at 1:28

1 vote

How to solve this nonstandard system of equations?

answered May 7, 2015 at 4:03

1 vote

Solving trigonometric equations without a calculator or tables

answered Sep 26, 2012 at 14:46

1 vote

Solving an equation with three quadratic radicals in the set of real numbers

answered Sep 25, 2012 at 9:38

1 vote

Accepted

Find the coordinates of P

answered Oct 6, 2012 at 15:04

1 vote

Analytic Geometry question I can't solve

answered Oct 6, 2012 at 15:37

1 vote

Find the distance between the line and plane

answered Oct 9, 2012 at 16:27

0 votes

Solve $5a^2 - 4ab - b^2 + 9 = 0$, $ - 21a^2 - 10ab + 40a - b^2 + 8b - 12 = 0$

answered Oct 10, 2012 at 15:29

0 votes

Find the vector and Cartesian equation?

answered Oct 7, 2012 at 15:54

0 votes

Trigonometric proof

answered Oct 3, 2012 at 8:49

0 votes

Simple Vector Question in $\mathbb{R}^3$

answered Sep 26, 2012 at 7:13

0 votes

Sphere tangent to a plane

answered Sep 24, 2012 at 10:47

0 votes

How do we solve the equation?

answered Sep 26, 2012 at 16:18

0 votes

How can I prove that modul of this vector bigger than radius of a circle?

answered Jul 28, 2015 at 0:50

0 votes

Solve equations $\sqrt{t +9} - \sqrt{t} = 1$

answered Jul 20, 2015 at 23:36

0 votes

Is there a triangle like this?

answered Sep 16, 2013 at 12:34

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30 Answers

How to prove $\cos \frac{2\pi }{5}=\frac{-1+\sqrt{5}}{4}$?

$\int \frac{\sin^3x}{\sin^3x + \cos^3x)}$?

Find if three points in 3-dimensional space are collinear

Finding the Extrema of a Function (without differetiation)

Solving an equation with three quadratic radicals in the set of real numbers

How can I find the integral?

Solving $ \sin x + \sqrt 3 \cos x = 1 $ - is my solution correct?

Prove $3(\sin x-\cos x)^4 + 6(\sin x+ \cos x)^2 + 4(\sin^6 x + \cos^6 x) -13 = 0$

Solve $3\log_{10}(x-15) = \left(\frac{1}{4}\right)^x$

Line parallel to plane but not on the plane?

How to solve this trigonometric equation?

How to solve this irrational equation?

How can I solve this nice rational equation

Complex numbers equation: $z^4 = -16$

Solve this equation: $7x^3+11x^2+6x+2=(x+2)\sqrt[3]{x^3+3x^2+5x+1}$

How to solve this nonstandard system of equations?

Solving trigonometric equations without a calculator or tables

Solving an equation with three quadratic radicals in the set of real numbers

Find the coordinates of P

Analytic Geometry question I can't solve

Find the distance between the line and plane

Solve $5a^2 - 4ab - b^2 + 9 = 0$, $ - 21a^2 - 10ab + 40a - b^2 + 8b - 12 = 0$

Find the vector and Cartesian equation?

Trigonometric proof

Simple Vector Question in $\mathbb{R}^3$

Sphere tangent to a plane

How do we solve the equation?

How can I prove that modul of this vector bigger than radius of a circle?

Solve equations $\sqrt{t +9} - \sqrt{t} = 1$

Is there a triangle like this?