Question
$\int\limits_0^{\pi/4}\Bigg(\sqrt{\text{tan x}}+\sqrt{{\text{cot x}}}\Bigg)\text{ dx}=\sqrt{2}\cdot\frac{\pi}{2}$

Answer

$\int\limits_0^{\pi/4}\Bigg(\sqrt{\text{tan x}}+\sqrt{{\text{cot x}}}\Bigg)\text{ dx}$ = $\int\limits_0^{\pi/4}\frac{\text{sin x + cos x}}{\sqrt{\text{sin x cos x }}}\text{dx}$Putting sin x – cos x = t, to get (cos x + sin x) dx = dt
and sin x cos x = $\frac{\text{1 - t}^{2}}{2}$
$\therefore 1=\sqrt{2}\int\limits_{-1}^{0}\frac{\text{dt}}{\sqrt{\text{1 - t}^{2}}}$= $\sqrt{2}\cdot[\sin^{-1}\text{t}]^{0}_{-1}$
$=\sqrt{2}(\sin^{-1}\text{0}-\sin^{-1}(-1)=\sqrt{2}\cdot\frac{\pi}{2}$.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Without expanding, show that the values of the following determinant are zero: $\begin{vmatrix}6&-3&2\\2&-1&2\\-10&5&2 \end{vmatrix}$
If $\text{A}=\begin{bmatrix}3&-4\\1&1\\2&0\end{bmatrix}$ and $\text{B}=\begin{bmatrix}2&1&2\\1&2&4\end{bmatrix},$ then verify $(\text{BA})^2\neq\text{B}^2\text{A}^2.$
Evaluate the following integrals:$\int\frac{\sin2\text{x}}{\sqrt{\sin^4\text{x}+4\sin^2\text{x}-2}}\text{ dx}$
Solve the following equation for x:
$\tan^{-1}\Big(\frac{\text{x}-2}{\text{x}-4}\Big)+\tan^{-1}\Big(\frac{\text{x}+2}{\text{x}+4}\Big)=\frac{\pi}{4}$
Evaluate the following integrals: $\int\frac{\text{x}^2-3\text{x}+1}{\text{x}^4+\text{x}^2+1}\ \text{dx}$
Solve the following differential equations:
$\text{x}\frac{\text{dy}}{\text{dx}}+\cot\text{y}=0,$ given that $\text{y}=\frac{\pi}{4},$ when $\text{x}=\sqrt{2}.$
Use product $\begin{bmatrix}1&-1&2\\0&2&-3\\3&-2&4\end{bmatrix}\begin{bmatrix}-2&0&1\\9&2&-3\\6&1&-2\end{bmatrix}$ to solve the system of equations $x + 3z = 9, -x + 2y - 2z = 4, 2x - 3y + 4z = -3.$
A card is drawn from a pack of 52 cards so that each card is equally likely to be selected. In which of the following cases are the events A and B independent?
A = The card drawn is a king or queen,
B = the card drawn is a queen or jack.
A firm manufactures two types of products $A$ and $B$ and sells them at a profit of $Rs. 5$ per unit of type $A$ and $Rs.3$ per unit of type $B.$ Each product is processed on two machines $M_1$ and $M_2.$ One unit of type A requires one minute of processing time on $M_1$ and two minutes of processing time on $M_2,$ whereas one unit of type $B$ requires one minute of processing time on $M_1$ and one minute on $M_2.$ Machines $M_1$ and $M_{2 }$ are respectively available for at most $5$ hours and $6$ hours in a day. Find out how many units of each type of product should the firm produce a day in order to maximize the profit. Solve the problem graphically.
Solve the following differential equation:
$\big(\text{y}^2-2\text{xy}\big)\text{dx}=\big(\text{x}^2-2\text{xy}\big)\text{dy}$