Question

give one example of two irrational number whose product is rational​

Answer 1

Any two surds with the same square root. Since there are infinitely many solutions I cannot pinpoint the solution you require. For example, sqrt(3) (irrational) and -sqrt(3) (irrational) multiply to give -3 (rational). Also, 2sqrt(2) (irrational) and sqrt(2) (irrational) multiply to give 8 (rational).

Hopefully this helps you