V. S. Kulikov, “On the Equation F($\cos$x,$\sin$x) = 0, F($z_1$,$z_2$) Being a Quadratic Polynomia”, Math. Ed., 1999, Issue 4(11),Pages 35

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Math. Ed., 1999 Issue 4(11), Pages 35–40 (Mi mo331)

Students and teachers of secondary school

On the Equation F($\cos$x,$\sin$x) = 0, F($z_1$,$z_2$) Being a Quadratic Polynomia

V. S. Kulikov