Algebraic twists of $\mathrm{GL}_3\times \mathrm{GL}_2$ $L$-functions

We prove that the coefficients of a $\mathrm{GL}_3\times \mathrm{GL}_2$ Rankin--Selberg $L$-function do not correlate with a wide class of trace functions of small conductor modulo primes, generalizing the corresponding result \cite{FKM1} for~$\mathrm{GL}_2$ and \cite{KLMS} for $\mathrm{GL}_3$. This result is inspired by a recent work of P. Sharma who discussed the case of a Dirichlet character of prime modulus.

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