List questions from functions

Published on 10 Apr 2026 - 1:13

93

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Tan of difference of two angles given as sum of sines and cosines

Published on 10 Apr 2026 - 1:13

94

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How to prove function surjective

Published on 10 Apr 2026 - 13:55

1.3k

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If $f$ is injective and $g$ is not injective, $g\circ f$ is not injective?

Published on 02 Apr 2026 - 10:16

74

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How can find out if the coordinate (0,4) belongs to a parabola or a linear function?

Published on 10 Apr 2026 - 3:04

202

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What is the range of the function $f(x)=\frac{4x(x^2+1)}{x^2+(x^2+1)^2}$?

Published on 08 Apr 2026 - 19:44

117

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Functional equation $2f\left(\frac{x+y}{2}\right)-f(y)=f''(x)$

Published on 08 Apr 2026 - 22:43

162

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Injectivity of a function $\frac{x}{1+|x|}$

Published on 05 Apr 2026 - 19:37

129

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Proving that $b-a\ge \pi $

Published on 10 Apr 2026 - 13:28

159

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Is there a name for this operation? $f(a, b) = a + (1 - a)b$

Published on 10 Apr 2026 - 10:42

50

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Why "iterative" function $f(x)=k\sqrt[2]{x}$ converge to $k^2$

Published on 06 Apr 2026 - 21:52

1.3k

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Solution of the trigonometric equation $\sin5x =\cos2x$

Published on 09 Apr 2026 - 0:05

39

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Question about surjectivity of a linear map

Published on 01 Apr 2026 - 22:42

64

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Continuity Implications in any topological space

Published on 02 Apr 2026 - 3:44

85

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Number of Boolean functions

Published on 26 Mar 2026 - 23:51

List Question

Sine of the sum of two solutions of $a\cos\theta + b \sin\theta = c$

Tan of difference of two angles given as sum of sines and cosines

How to prove function surjective

If $f$ is injective and $g$ is not injective, $g\circ f$ is not injective?

How can find out if the coordinate (0,4) belongs to a parabola or a linear function?

What is the range of the function $f(x)=\frac{4x(x^2+1)}{x^2+(x^2+1)^2}$?

Functional equation $2f\left(\frac{x+y}{2}\right)-f(y)=f''(x)$

Injectivity of a function $\frac{x}{1+|x|}$

Proving that $b-a\ge \pi $

Is there a name for this operation? $f(a, b) = a + (1 - a)b$

Why "iterative" function $f(x)=k\sqrt[2]{x}$ converge to $k^2$

Solution of the trigonometric equation $\sin5x =\cos2x$

Question about surjectivity of a linear map

Continuity Implications in any topological space

Number of Boolean functions

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