MGMC_2020

দৃশ্যকল্প-১ : f(x)=2x1+x2;g(y)=1y21+y2f(x)=\frac{2 x}{1+x^{2}} ; g(y)=\frac{1-y^{2}}{1+y^{2}} দৃশ্যকল্প-২ : h(x)=sinx\mathrm{h}(\mathrm{x})=\sin \mathrm{x}ক. cosec117+sec1265\operatorname{cosec}^{-1} \sqrt{17}+\sec ^{-1} \frac{\sqrt{26}}{5} এর মান নির্ণয় কর।খ. cosec11f(a)sec11g(b)=2tan1x\operatorname{cosec}^{-1} \frac{1}{f(a)}-\sec ^{-1} \frac{1}{g(b)}=2 \tan ^{-1} x হলে, দেখাও যে, x=ab1+abx=\frac{a-b}{1+a b}গ. সমাধান কর : 3 h(x)h(π2+x)=2\sqrt{3} \mathrm{~h}(\mathrm{x})-\mathrm{h}\left(\frac{\pi}{2}+\mathrm{x}\right)=2 যখন 2π<x<2π-2 \pi<x<2 \pi

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