MCQ
$\int \frac{1}{\left(e^x+e^{-x}\right)^2} d x=\ldots \ldots \ldots$
- ✓$-\frac{1}{2\left(e^{2 x}+1\right)}+c$
- B$\frac{1}{2\left(e^{2 x}+1\right)}+c$
- C$-\frac{1}{e^{2 x}+1}$
- Dએક પણ નહીં
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$\left(1+\cos ^{2} \theta\right) x+\sin ^{2} \theta y+4 \sin 3 \theta z=0$
$\cos ^{2} \theta x+\left(1+\sin ^{2} \theta\right) y+4 \sin 3 \theta z=0$
$\cos ^{2} \theta x+\sin ^{2} \theta y+(1+4 \sin 3 \theta) z=0$
ને શૂન્યતર ઉકેલ ધરાવે છે તો $\theta$ ની કિમંત મેળવો.