$\sin \theta =-1, \theta =(4n+1)\mathrm{\pi }/2$

$\mathrm{cos\theta }=-1, \mathrm{\theta }=(2\mathrm{n}+1)\mathrm{\pi }$

$\mathrm{sin\theta }=1, \mathrm{\theta }=(4\mathrm{n}-1)\mathrm{\pi }/2$

$\mathrm{cos\theta }=1, \mathrm{\theta }=\mathrm{n\pi }$

e

2+e

2e

2

$-\sqrt{3x}+y=6$

$\sqrt{3x}+y=3$

$\sqrt{3x}+y=6$

$\sqrt{2x}+3y=6$

2

1/2

8

1/2

1/3

1/4

2/3

$\int secxdx=In\left|\tan (\frac{\mathrm{\pi }}{4}-\frac{x}{2})\right|$

$\int secxdx=In\left|\tan (\frac{\mathrm{\pi }}{4}+\frac{x}{2})\right|$

$\int secxdx=In\left|secx+\tan x\right|$

$\int \frac{dx}{a^2+x^2}=\frac{1}{2}{\tan }^{-1}\frac{x}{a}$

π/2

π/10

π/8

π/12

2.5 N

3.5N

4.5N

5.5N

1

-13

2+3i

2-3i

π

π/2

3π

π/4

9

5

15

35

সমদ্বিবাহু

সমবাহু

সমকোণী

স্থুলকোণী

5x+y=10

x+5y=10

5x+y=5

x+5y=5

(4, 4)

(2, 2)

(2, 4)

(19/4, 2)

13

12

13

112

121

211

122

3+23i

2+23i

4+23i

2+22i

$\left[\begin{array}{c}0\\ 5\end{array}\right]$

$\left[\begin{array}{c}2\\ 5\end{array}\right]$

$\left[\begin{array}{c}2\\ 3\end{array}\right]$

$\left[\begin{array}{c}4\\ 5\end{array}\right]$

4032

4050

40502

40320

5/7

5/12

7/12

3/5

${}^{16}C_5$

${}^{10}C_3$

${}^{16}C_8$

${}^{8}C_{10}$

$\cos 3A=3\cos A-4{\cos }^{3}A$

$\tan 3A=\frac{3\tan A-{\tan }^{3}A}{1-3{\tan }^{2}A}$

$\sin 3A=3\sin A-4{\sin }^{3}A$

$\cos 2A=\frac{1-{\tan }^{2}A}{1+{\tan }^{2}A}$

2/3

√3/2

√2

1/√2

30°

90°

45°

60°