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d.k
  • Member for 12 years, 1 month
  • Last seen more than a month ago
  • Kharkov
15 votes
2 answers
115k views

How to find a basis of an image of a linear transformation?

6 votes
2 answers
175 views

Missing and parasite roots in the trigonometric equation.

4 votes
1 answer
203 views

Is it allowed to divide an equation by an expression which can be equal to zero?

4 votes
2 answers
263 views

Please, help me to find where is a mistake in the solutions of the equation.

4 votes
1 answer
38k views

How to find an equation of a plane perpendicular to two other planes and passing through a point

4 votes
2 answers
8k views

Does a complex number multiplication have a geometric representation and why? [duplicate]

4 votes
3 answers
693 views

reduction of $6xy + 8 y^2 -12x-26y + 11 = 0$ to canonical one of a second-order curve

2 votes
1 answer
65 views

Need an explanation of a particular expression transformation

2 votes
2 answers
2k views

How to find a power function, representing a model for data?

2 votes
1 answer
111 views

Can somebody provide an explanation to the formula of a one elementary integral?

2 votes
1 answer
3k views

Software to easily draw 3d plots from functions

2 votes
1 answer
2k views

How to find the second derivative of y in $y^2 = x^2 + 2x$?

2 votes
1 answer
158 views

How to show that "whenever $v \ne 0$", $m\frac{dv}{dt} = -kx$

2 votes
4 answers
158 views

How to find limit of $2x+ (4x^2 +3x - 2)^{1/2}$ when $x\to-\infty$

2 votes
1 answer
53 views

How to find the derivative of $x{^2/3} - (x - 1)^{1/3}$ by the limit calculation?

2 votes
2 answers
83 views

How to solve $\frac{dy}{dx} = \frac{1}{\sqrt{2^2 - x^2}}$?

1 vote
0 answers
85 views

rate of change of an angle, which equals $\pi$ - the sum of two other angles

1 vote
1 answer
306 views

Explanation of the 'If and only if' statement's rules

1 vote
2 answers
95 views

Please, I need a more detailed explanation of the particular solution of the problem with vectors

1 vote
2 answers
107 views

How can $1 + 2^{1/x} = 0$ be solved?

1 vote
2 answers
46 views

Help to spot an error in a solution of an equation, involving absolute value expressions

1 vote
1 answer
37 views

Is it possible to find a limit of a product of functions, provided limits of their sum and difference are known?

1 vote
2 answers
147 views

How to get the formula for the derivative of the $y=x|x|$ function?

1 vote
2 answers
66 views

Could someone elaborate on this algebraic transformation?

1 vote
1 answer
858 views

How to solve the problem "A large room contains two speakers that are 3 meters apart …"?

0 votes
1 answer
101 views

How to find all possible pairs of the cells in a table excluding those from the same column

0 votes
3 answers
3k views

how to prove $ax + by = cx + dy \implies a = c, b = d$?

0 votes
1 answer
47 views

Could anybody provide a more detailed explanation of a tangent equation in its general form?

0 votes
1 answer
66 views

For an arbitrary vertex in an arbitrary polygon how to determine which of the vertex's angles lies inside the polygon knowing only the coordinates?

0 votes
1 answer
73 views

Find $\sum^{30}_{k=7}(\sqrt{k - 4} - \sqrt{k - 3})$ without explicitly calculating the 24 complements