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Feb
13
reviewed Edit Proving this inequality
Feb
13
revised Proving this inequality
clarified that the answer is a counter example.
Feb
13
reviewed Reviewed Unreachable rubik cube positions.
Feb
13
comment Unreachable rubik cube positions.
The OP explicitly stated "by applying standard moves", so moving stickers doesn't count. This answer does not address the intent of the OP.
Feb
13
reviewed Approve Finding Tangent Line and Slope of a curve
Feb
12
comment Linear Algebra - Show that $M$ is not a vector space
So $\begin{bmatrix}0&b\\c&d\end{bmatrix}$ and $\begin{bmatrix}a&b\\c&0\end{bmatrix}$ are in the set. Is their sum in the set?
Feb
12
comment Linear Algebra - Show that $M$ is not a vector space
Is the set closed under addition?
Feb
11
reviewed Approve How to show if a function is continuous
Feb
9
reviewed Approve Find subfield of R? Other than Q.
Feb
9
reviewed No Action Needed Give context-free grammars that generate these languages
Feb
9
comment a and b are integers where gcd(a,b)=p which is a prime. find gcd(a^2,b^2).
By squaring a and b, you do not introduce any additional prime factors.
Feb
7
comment Physics Vector Problem - Airplane
@JohnHabert, Yes, of course. Good catch... should have sketched it out.
Feb
7
comment Physics Vector Problem - Airplane
It is like the Pythagorean theorem but for general triangles. It is ideal to use when you know two sides and the angle between them to find the third side. In your case the two sides are your two lengths, the angle is 70 degrees.
Feb
7
comment Physics Vector Problem - Airplane
Do you know the law of cosines?
Feb
7
comment Basic Euclidean Geometry, Circle Arc
Your strategy would depend on the relative distance between the way points and the turning radius of your vehicle. If the distance is much larger than the radius, then you should just point and shoot for the next way point (i.e. drive a straight line), if they are of the same order of magnitude you will probably need to compute curve paths.
Feb
6
reviewed Reviewed Indefinite integral of secant cubed
Feb
6
revised Indefinite integral of secant cubed
Added LaTeX for equation.
Feb
5
reviewed Approve Basic analysis - sequence convergence
Feb
4
reviewed Approve For how many values of $n$ with $0\le n\le100$ is the graph of $f(x)=\sin(x+n)$ identical to the graph of $g(x)=\cos x$?
Feb
2
awarded  Nice Answer