The original gangster.

This is the dream cheating software every student should know about.

It also has serious applications obviously. www.sympy.org/scipy-2017-codegen-tutorial/ mentions code generation capabilities, which sounds super cool!

The code in this section was tested on

`sympy==1.8`

and Python 3.9.5.Let's start with some basics. fractions:
outputs:
Note that this is an exact value, it does not get converted to floating-point numbers where precision could be lost!

```
from sympy import *
sympify(2)/3 + sympify(1)/2
```

`7/6`

We can also do everything with symbols:
outputs:
We can now evaluate that expression object at any time:
outputs:

```
from sympy import *
x, y = symbols('x y')
expr = x/3 + y/2
print(expr)
```

`x/3 + y/2`

`expr.subs({x: 1, y: 2})`

`4/3`

How about a square root?
outputs:
so we understand that the value was kept without simplification. And of course:
outputs
outputs:
gives:

```
x = sqrt(2)
print(x)
```

`sqrt(2)`

`sqrt(2)**2`

`2`

. Also:
`sqrt(-1)`

`I`

`I`

is the imaginary unit. We can use that symbol directly as well, e.g.:
`I*I`

`-1`

Let's do some trigonometry:
gives:
and:
gives:
The exponential also works:
gives;

`cos(pi)`

`-1`

`cos(pi/4)`

`sqrt(2)/2`

`exp(I*pi)`

`-1`

Now for some calculus. To find the derivative of the natural logarithm:
outputs:
Just read that. One over x. Beauty.

```
from sympy import *
x = symbols('x')
diff(ln(x), x)
```

`1/x`

Let's do some more. Let's solve a simple differential equation:
Doing:
outputs:
which means:
To be fair though, it can't do anything crazy, it likely just goes over known patterns that it has solvers for, e.g. if we change it to:
it just blows up:
Sad.

`y''(t) - 2y'(t) + y(t) = sin(t)`

```
from sympy import *
x = symbols('x')
f, g = symbols('f g', cls=Function)
diffeq = Eq(f(x).diff(x, x) - 2*f(x).diff(x) + f(x), sin(x)**4)
print(dsolve(diffeq, f(x)))
```

`Eq(f(x), (C1 + C2*x)*exp(x) + cos(x)/2)`

$f(x)=C_{1}+C_{2}xe_{x}+cos(x)/2$

`diffeq = Eq(f(x).diff(x, x)**2 + f(x), 0)`

`NotImplementedError: solve: Cannot solve f(x) + Derivative(f(x), (x, 2))**2`

Let's try some polynomial equations:
which outputs:
which is a not amazingly nice version of the quadratic formula. Let's evaluate with some specific constants after the fact:
which outputs
Let's see if it handles the quartic equation:
Something comes out. It takes up the entire terminal. Naughty. And now let's try to mess with it:
and this time it spits out something more magic:
Oh well.

```
from sympy import *
x, a, b, c = symbols('x a b c d e f')
eq = Eq(a*x**2 + b*x + c, 0)
sol = solveset(eq, x)
print(sol)
```

`FiniteSet(-b/(2*a) - sqrt(-4*a*c + b**2)/(2*a), -b/(2*a) + sqrt(-4*a*c + b**2)/(2*a))`

`sol.subs({a: 1, b: 2, c: 3})`

`FiniteSet(-1 + sqrt(2)*I, -1 - sqrt(2)*I)`

```
x, a, b, c, d, e, f = symbols('x a b c d e f')
eq = Eq(e*x**4 + d*x**3 + c*x**2 + b*x + a, 0)
solveset(eq, x)
```

```
x, a, b, c, d, e, f = symbols('x a b c d e f')
eq = Eq(f*x**5 + e*x**4 + d*x**3 + c*x**2 + b*x + a, 0)
solveset(eq, x)
```

`ConditionSet(x, Eq(a + b*x + c*x**2 + d*x**3 + e*x**4 + f*x**5, 0), Complexes)`

Let's try some linear algebra.
Let's invert it:
outputs:

`m = Matrix([[1, 2], [3, 4]])`

`m**-1`

```
Matrix([
[ -2, 1],
[3/2, -1/2]])
```