MCQ
$\int {\frac{{dx}}{{{x^2} + 4x + 13}}} $ =
- A$\log ({x^2} + 4x + 13) + c$
- ✓$\frac{1}{3}{\tan ^{ - 1}}\left( {\frac{{x + 2}}{3}} \right) + c$
- C$\log (2x + 4) + c$
- D$\frac{{2x + 4}}{{{{({x^2} + 4x + 13)}^2}}} + c$
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$2 x+y-z=5$
$2 x-5 y+\lambda z=\mu$
$x+2 y-5 z=7$
ને અસંખ્ય ઉકેલો હોય,તો
$(\lambda+\mu)^2+(\lambda-\mu)^2=........$