double differentiation meaning in Hindi

• द्वि श: अवकलन • द्विशः अवकलन

double: चाल दुगुना जितना
differentiation: अवकलन भेदभाव

Double differentiation of this term results in trigamma functions.
The only non-zero term upon double differentiation of the log likelihood function with respect to the exponents ? and ? is the second derivative of the log of the beta function : ln ( B ( ?, ? ) ).