There are two modes when a cell is highlighted.

- create a new cell above the current cell: a
- create a new cell below the current cell: b
- delete the current cell: dd
- change the current cell’s type to “Code”: y
- change the current cell’s type to “Markdown”: m

- execute the current cell and create a new cell: SHIFT + ENTER

- $2^{16}$
- $\dfrac{2-(3+4\cdot7)}{5}$
- $(2-3i)+(4+i)$
- $(2+i)(4-3i)$
- $\sqrt{234}$
- 13//4
- -10 // 3
- $\sin(3\pi/5)$ (Use math.pi)

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```
```

x = 3 y = 10 z = -5

- $x\leq 1$ or $y = 10$
- $z > 0$ and $y > 0$
- not $(x\neq 3$ or $y >= -5)$

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```
```

In [103]:

```
total = 384
```

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```
```

In [1]:

```
import math # use math.sqrt()
```

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```
```

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```
```