Qurak
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One expression, computed by the engine, without an account.

5 anonymous evaluations an hour, a 1-second budget, the mathematics only. An account lifts all three.

Or try one of these

Series[Tan[x], {x, 0, 9}]Integrate[Sin[x]/x, {x, 0, Infinity}]Eigenvalues[{{2, 0, 0, 1}, {0, 3, 1, 0}, {0, 1, 3, 0}, {1, 0, 0, 2}}]FactorInteger[987654321987]Sum[1/n^4, {n, 1, Infinity}]DSolve[y''[x] + y[x] == 0, y[x], x]