```calc
x/2 + x/3 -> ?
diff(x*sin(x), x) -> ?
int(x*sin(x), x) -> ?
```

```calc
(x + 1)^2 -> expand -> ?
x^2 - 1 -> factor -> ?
x^2 - 4 -> solve(x) -> ?
a*x^2 + b*x + c -> solve(x) -> ?
sin(x) -> series(x, 6) -> ?
π -> float(4) -> ?
```

```calc
x^2 + 1 -> substitute(x == y + 1) -> expand -> ?
sqrt(x^2) -> assume(x > 0) -> simplify -> ?
```

```calc
int(x^2, x, 0, a) -> ?
lim(sin(x)/x, x, 0) -> ?
sum(1/k^2, k, 1, ∞) -> ?
1/(s^2 + 1) -> invlaplace(s) -> ?
```

```calc
[x + y == 3; x - y == -1] -> solve(x, y) -> ?
```

```calc
w := 3
w^2 + z -> ?
g_1(u) := u^2
diff(g_1(t), t) -> ?
```