multiply: 3*x^2 not 3x^2 factorial: 10! or factorial(10) combinatorics: ncr(n,k), npr(n,k), gcd(a,b), lcm(a,b) primes: isprime(n), nextprime(n), factors(n), divisors(n) functions: sqrt(), abs(), floor(), ceil(), round() exact by default: fractions and big integers show exactly, not as decimals