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r^2=x^2+y^2+z^2 হলে প্রমাণ করো যে, tan^-...

`r^2=x^2+y^2+z^2` হলে প্রমাণ করো যে, `tan^-1(frac[yz][rx])+tan^-1(frac[zx][ry])+tan^-1(frac[xy][rz])=frac[pi][2]`

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