MCQ
${d \over {dx}}{({x^2} + \cos x)^4} = $
- A$4({x^2} + \cos x)(2x - \sin x)$
- B$4{({x^2} - \cos x)^3}(2x - \sin x)$
- ✓$4{({x^2} + \cos x)^3}(2x - \sin x)$
- D$4{({x^2} + \cos x)^3}(2x + \sin x)$
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$x+y+\sqrt{3} z=0$
$-x+(\tan \theta) y+\sqrt{7} z=0$
$x+y+(\tan \theta) z=0$
ને અસાહજિક $(non-trivial)$ ઉકેલ છે.તો $\frac{120}{\pi} \sum_{\theta \in s} \theta=.........$