MCQ
$\int\limits_0^{\frac{\pi }{2}} {\sqrt {\sec x + 1} \,\,dx = ..........} $
- A$0$
- B$\pi $
- ✓$\frac{\pi }{2}$
- D$2\pi $
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$ 11 x+y+\lambda z=-5 $
$ 2 x+3 y+5 z=3 $
$ 8 x-19 y-39 z=\mu$
ને અસંખ્ય ઉકેલો હોય, તો $\lambda^4-\mu=$.............