recently, I study a research paper, and a problem confuse me, so i need help:(adsbygoogle = window.adsbygoogle || []).push({});

q(t,x)=z(t,x)+\int_t^T{k(\tau, t) z(\tau, x) d\tau } (1)

and q_t=z_t+\int_t^T{k_t(\tau, t) z(\tau, x) d\tau }- k(t,t)z(t) (2)

problem: how to according to (1) can get (2) ? please give me detailed process, thank you!

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# How to get the derivative

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