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Jamia Millia Islamia MCA Previous Year Questions (PYQs)

Jamia Millia Islamia MCA Inverse Trigonometrical Function PYQ

Jamia Millia Islamia MCA PYQ
Principal value of $\cos^{-1}(\cos 5)$ is





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Jamia Millia Islamia MCA Previous Year PYQ Jamia Millia Islamia MCA JAMIA MILLIA ISLAMIA MCA 2018 PYQ

Solution

For the principal range $[0, \pi]$, $\cos^{-1}(\cos 5) = 2\pi - 5$.
Jamia Millia Islamia MCA PYQ
If $y=\tan^{-1}\!\left(\dfrac{1+x}{1-x}\right)$, then $\dfrac{dy}{dx}$ equals …





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Jamia Millia Islamia MCA Previous Year PYQ Jamia Millia Islamia MCA JAMIA MCA 2017 PYQ

Solution

$y'=\dfrac{u'}{1+u^{2}}$, $u=\dfrac{1+x}{1-x}$. $u'=\dfrac{2}{(1-x)^2}$, $1+u^2=\dfrac{2(1+x^2)}{(1-x)^2}$. Hence $y'=\dfrac{1}{1+x^2}$.
Jamia Millia Islamia MCA PYQ
If $y=\cos^{-1}x$ and $z=\sin^{-1}\!\sqrt{1-x^{2}}$, then $\dfrac{dy}{dz}$ equals …





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Jamia Millia Islamia MCA Previous Year PYQ Jamia Millia Islamia MCA JAMIA MCA 2017 PYQ

Solution

For $x\in[-1,1]$, $\sqrt{1-x^2}=\sin(\cos^{-1}x)=\sin y$. Thus $z=\sin^{-1}(\sin y)$, so $z=y$ (up to piecewise sign); hence $\dfrac{dy}{dz}=1$.
Jamia Millia Islamia MCA PYQ
Simplified form of $\cos^{-1}(4x^3 - 3x)$ is





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Jamia Millia Islamia MCA Previous Year PYQ Jamia Millia Islamia MCA JAMIA MILLIA ISLAMIA MCA 2024 PYQ

Solution

$\cos(3\theta) = 4\cos^3\theta - 3\cos\theta$ Hence, if $x = \cos\theta$, then $\cos^{-1}(4x^3 - 3x) = \cos^{-1}(\cos 3\theta) = 3\cos^{-1}x$
Jamia Millia Islamia MCA PYQ
$\tan^{-1}!\left(\dfrac{1}{2}\right) + \tan^{-1}!\left(\dfrac{1}{3}\right) =$





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Jamia Millia Islamia MCA Previous Year PYQ Jamia Millia Islamia MCA JAMIA MILLIA ISLAMIA MCA 2024 PYQ

Solution

$\tan^{-1}a + \tan^{-1}b = \tan^{-1}!\left(\dfrac{a + b}{1 - ab}\right)$ Here, $a = \dfrac{1}{2}$, $b = \dfrac{1}{3}$ $\Rightarrow \dfrac{a + b}{1 - ab} = \dfrac{\frac{5}{6}}{1 - \frac{1}{6}} = 1$ $\Rightarrow \tan^{-1}(1) = \dfrac{\pi}{4}$
Jamia Millia Islamia MCA PYQ
$\sin(\tan^{-1}x)$, where $|x| < 1$, is equal to





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Jamia Millia Islamia MCA Previous Year PYQ Jamia Millia Islamia MCA JAMIA MILLIA ISLAMIA MCA 2024 PYQ

Solution

Let $\theta = \tan^{-1}x \Rightarrow \tan\theta = x$ In right triangle: opposite = $x$, adjacent = $1$ $\Rightarrow \sin\theta = \dfrac{x}{\sqrt{1 + x^2}}$

Jamia Millia Islamia MCA

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