Hi all,

I want to ask whether I am right that the triangle region between 0 and \pi/2 should not be included for region bounded by \sin (x) and \cos (x) between x = - \pi / 4 and x = 3 \pi / 4 ?

But, In the plot below it becomes dark blue since it is filled twice. How to make it all correctly filled so none is darker than the other?

```
using Plots, LaTeXStrings, Plots.PlotMeasures, CalculusWithJulia
gr()
function pitick(start, stop, denom; mode=:text)
a = Int(cld(start, π/denom))
b = Int(fld(stop, π/denom))
tick = range(a*π/denom, b*π/denom; step=π/denom)
ticklabel = piticklabel.((a:b) .// denom, Val(mode))
tick, ticklabel
end
function piticklabel(x::Rational, ::Val{:text})
iszero(x) && return "0"
S = x < 0 ? "-" : ""
n, d = abs(numerator(x)), denominator(x)
N = n == 1 ? "" : repr(n)
d == 1 && return S * N * "π"
S * N * "π/" * repr(d)
end
function piticklabel(x::Rational, ::Val{:latex})
iszero(x) && return L"0"
S = x < 0 ? "-" : ""
n, d = abs(numerator(x)), denominator(x)
N = n == 1 ? "" : repr(n)
d == 1 && return L"%$S%$N\pi"
L"%$S\frac{%$N\pi}{%$d}"
end
a, b = -2π, 2π
y(x) = sin(x)
y2(x) = cos(x)
xs1 = range(a, b, length=150)
plot(xs1, y, color=:red, xtick=pitick(a, b, 4; mode=:latex),
xlims=(-3,3), ylims=(-π/2,π/2),framestyle=:zerolines,
linestyle=:solid, linecolor=:red2,
legend=:topleft, label=L"y = \sin \ x",
bottom_margin=3mm,
size=(800, 460), tickfontsize=10)
plot!(xs1,y2, label=L"y = \cos \ x")
plot!(y,-π/4,3π/4, label="", fill=(0, 0.15, :blue))
plot!(y2,-π/4,3π/4, label="", fill=(0, 0.15, :blue))
```

**I tried PolygonArea and use plot!(y2 \ y, color=:green) → not working**