A movie screen on a wall is $\mathbf{2 0}$ feet high and $\mathbf{1 0}$ feet above the floor. What is the maximum viewing angle $\boldsymbol{\theta}$ (in radians) that can be achieved by positioning yourself at the optimal distance from the wall?
$\frac{\pi}{2}$
$\frac{\pi}{4}$
$\frac{\pi}{3}$
$\frac{\pi}{6}$
$$ \text { The expression } \frac{\tan \left(x-\frac{\pi}{2}\right) \cos \left(\frac{3 \pi}{2}+x\right)-\sin ^3\left(\frac{7 \pi}{2}-x\right)}{\cos \left(x-\frac{\pi}{2}\right) \tan \left(\frac{3 \pi}{2}+x\right)} \text { simplifies to: } $$
$\sin ^2 x$
$\cos ^2 x-\sin ^2 x$
$1+\cos ^2 x$
$-\left(1+\cos ^2 x\right)$
The function $\boldsymbol{x}+\boldsymbol{y}=\boldsymbol{\operatorname { t a n }}^{-\mathbf{1}} \boldsymbol{y}$ is the solution of which of the following differential equations?
$y^2 y^{\prime}-y^2+1=0$
$y^2-2 y^{\prime}+1=0$
$y^2 y^{\prime}+y^2+1=0$
$y^2 y^{\prime \prime}-2 y^{\prime}=0$
The function $f: \mathbb{R} \rightarrow \mathbb{R}$ defined by $f(x)=\frac{x}{x^2+1} \quad \forall x \in \mathbb{R}$ is
One-one and onto
Onto but not one-one
Neither one-one nor onto
One-one but not onto
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