MCQ
$\int \frac{d x}{x^2+2 x+5}=$ ________ + C.
- A$\tan ^{-1}\left(\frac{x+1}{2}\right)$
- ✓$\frac{1}{2} \tan ^{-1}\left(\frac{x+1}{2}\right)$
- C$\tan ^{-1}(x+1)$
- D$\frac{1}{2} \tan ^{-1}(x+1)$
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$x-2 y+5 z=0$
$-2 x+4 y+z=0$
$-7 x+14 y+9 z=0$
માટે એવા મળે કે જેથી $15 \leq x^{2}+y^{2}+z^{2} \leq 150$ તો ગણ $S$ ના ઘટકોની સંખ્યાઓ શોધો.