$= \int_0^1 {{{\tan }^{ - 1}}x\,dx - } \int_0^1 {{{\tan }^{ - 1}}(x - 1)} \,dx$
$ = 2\int_{\,0}^{\,1} {{{\tan }^{ - 1}}x\,dx} $
$= 2\,[{\tan ^{ - 1}}x - \frac{1}{2}\log (1 + {x^2})]_0^1 $
$= \frac{\pi }{2} - \log 2.$
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$\overrightarrow {AB} \,\,.\,\,\overrightarrow {CD} \,\, + \,\overrightarrow {\,BC} \,\,.\,\,\overrightarrow {AD} \,\, + \overrightarrow {CA} \,\,.\,\,\overrightarrow {BD} \,\, = $
तथा $\mathrm{f}(0)=0$ है। तो $\mathrm{f}\left(\frac{\pi}{2}\right)$ बराबर है
($A$) $\operatorname{Im}\left(\mathrm{z}_1\right)>0$ and $\operatorname{Im}\left(\mathrm{z}_2\right)>0$
($B$) $\operatorname{Im}\left(\mathrm{z}_1\right)<0$ and $\operatorname{Im}\left(\mathrm{z}_2\right)>0$
($C$) $\operatorname{Im}\left(\mathrm{z}_1\right)>0$ and $\operatorname{Im}\left(\mathrm{z}_2\right)<0$
($D$) $\operatorname{Im}\left(\mathrm{z}_1\right)<0$ and $\operatorname{Im}\left(\mathrm{z}_2\right)<0$
नीचे दिये गये विकल्पों में से सही उत्तर का चयन कीजिए :