Let f1: RrarrR ,\ \ f2:(-pi/2,pi/2)->R\ \ f3:(-1,\ e^(pi/2)-2)rarrR and f4: RrarrR be functions defined by (i)f1(x)=sin(sqrt(1-e^(-x)^2)), (ii) f2(x)={(|sinx|)/(tan^(-1)x)\ \ \ \ \ if\ x!=0 1\ \ \ \ \ \ \ \ \ \ \ \
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geometry - Why is '$\frac{r^2\pi}{d^2}=\frac{\pi}{4}$'? (a.k.a. the ratio between a square and a circle, $a=d$) - Mathematics Stack Exchange
Why is the formula for surface area of a sphere [math]4\pi r^2[/math], and why is volume [math]\frac{4}{3}\pi r^3[/math]? - Quora
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The volume of a sphere is given by `V= 4/3 pi R^3` where R is the radius of the sphere a. Find t... - YouTube
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calculus - Show that the volume of a sphere of radius $r$ is $V = \frac{4}{3} \pi r^3$ - Mathematics Stack Exchange
![I=(P)/(4pi r^(2)) At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above. Which I=(P)/(4pi r^(2)) At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above. Which](https://d10lpgp6xz60nq.cloudfront.net/web-thumb/181172302_web.png)