two lines

using CairoMakie

x = -2π:0.1:2π
lines(x, sin.(x); color = "#56B4E9", linewidth = 2, label = L"sin",
    axis = (xlabel = L"x", ylabel = L"f(x)", xgridcolor = :red,
        xlabelsize = 22, ylabelsize = 22,
        xgridstyle = :dashdot, xgridwidth = 0.85,
        xtickalign = 1, xticksize = 20),
    figure = (size = (600, 400), fonts = (; regular= "CMU Serif")))

lines!(x, cos.(x); color = :black, linestyle = :dash, label = L"cos")
limits!(-2π, 2π, -1, 1)
axislegend("Legend", position = :lb);

┌ Warning: Keyword argument `bgcolor` is deprecated, use `backgroundcolor` instead.
└ @ Makie ~/.julia/packages/Makie/z2T2o/src/makielayout/blocks/legend.jl:22