diff --git a/tikz/artificial-neuron/artificial-neuron.tex b/tikz/artificial-neuron/artificial-neuron.tex
index 7cad1e0..7fb7582 100644
--- a/tikz/artificial-neuron/artificial-neuron.tex
+++ b/tikz/artificial-neuron/artificial-neuron.tex
@@ -13,17 +13,18 @@
 \begin{tikzpicture}
 	\node[draw,circle,minimum size=25pt,inner sep=0pt] (x) at (0,0) {$\Sigma$ $\varphi$};
 
-	\node[inputNode] (x0) at (-2, 1.5) {$\tiny x_0$};
-	\node[inputNode] (x1) at (-2, 0.75) {$\tiny x_1$};
-	\node[inputNode] (x2) at (-2, 0) {$\tiny x_2$};
-	\node[inputNode] (x3) at (-2, -0.75) {$\tiny x_3$};
-	\node[inputNode] (xn) at (-2, -1.75) {$\tiny x_n$};
+	\node[inputNode] (x0) at (-2, 1.5) {\color{red}$\tiny x_0$};
+	\node[inputNode] (x1) at (-2, 0.75) {\color{red}$\tiny x_1$};
+	\node[inputNode] (x2) at (-2, 0) {\color{red}$\tiny x_2$};
+	\node[inputNode] (x3) at (-2, -0.75) {\color{red}$\tiny x_3$};
+	\node[inputNode] (xn) at (-2, -1.75) {\color{red}$\tiny x_n$};
 
-	\draw[stateTransition] (x0) to[out=0,in=120] node [midway, sloped, above=-2] {$w_0$} (x);
-	\draw[stateTransition] (x1) to[out=0,in=150] node [midway, sloped, above=-2] {$w_1$} (x);
-	\draw[stateTransition] (x2) to[out=0,in=180] node [midway, sloped, above=-2] {$w_2$} (x);
-	\draw[stateTransition] (x3) to[out=0,in=210] node [midway, sloped, above=-2] {$w_3$} (x);
-	\draw[stateTransition] (xn) to[out=0,in=240] node [midway, sloped, above=-2] {$w_n$} (x);
+	\draw[stateTransition] (x0) to[out=0,in=120] node [midway, sloped, above=-2] {\color{green!40!black}$w_0$} (x);
+	\draw[stateTransition] (x1) to[out=0,in=150] node [midway, sloped, above=-2] {\color{green!40!black}$w_1$} (x);
+	\draw[stateTransition] (x2) to[out=0,in=180] node [midway, sloped, above=-2] {\color{green!40!black}$w_2$} (x);
+	\draw[stateTransition] (x3) to[out=0,in=210] node [midway, sloped, above=-2] {\color{green!40!black}$w_3$} (x);
+	\draw[stateTransition] (xn) to[out=0,in=240] node [midway, sloped, above=-2] {\color{green!40!black}$w_n$} (x);
+    \color{blue}
 	\draw[stateTransition] (x) -- (2,0) node [midway,above=-0.1cm] {};
 	\draw[dashed] (0,-0.43) -- (0,0.43);
 	\node (dots) at (-2, -1.15) {$\vdots$};
diff --git a/tikz/trigonomatric-functions/trigonomatric-functions.png b/tikz/trigonomatric-functions/trigonomatric-functions.png
index 6c795bf..8897605 100644
Binary files a/tikz/trigonomatric-functions/trigonomatric-functions.png and b/tikz/trigonomatric-functions/trigonomatric-functions.png differ
diff --git a/tikz/trigonomatric-functions/trigonomatric-functions.tex b/tikz/trigonomatric-functions/trigonomatric-functions.tex
index 8863bfe..cc8c3c9 100644
--- a/tikz/trigonomatric-functions/trigonomatric-functions.tex
+++ b/tikz/trigonomatric-functions/trigonomatric-functions.tex
@@ -11,8 +11,8 @@
 
 \begin{document}
 \begin{preview}
-\begin{tikzpicture}[very thick,font=\sansmath\sffamily,scale=2]
-    \newcommand\anglePoint{40}
+\begin{tikzpicture}[very thick,font=\sansmath\sffamily,scale=2.5]
+    \newcommand\anglePoint{50}
     \tkzDefPoint(0,0){O}
     \tkzDefPoint(1,0){D}
     \tkzDefPoint(0,1){E}
@@ -22,7 +22,7 @@
     \tkzDefPoint(\anglePoint:1){P}
 
     % Axes
-    \draw[gray] (O) circle (1);
+    \draw[gray, fill=gray!10] (O) circle (1);
     \node[gray,below right] at (1,0) {1};
     \node[blue,left] at (\anglePoint/2:1) {b};
     \node[gray,above right] at (0,1) {1};
@@ -33,7 +33,7 @@
 
     % \node[circle,fill=black,inner sep=0pt,minimum size=3pt,label=left:{$C_1$}] (C1) at (0,0) {};
     \tkzLabelPoints[below right,font=\sansmath\sffamily](O)
-    \tkzLabelPoints[above right,font=\sansmath\sffamily](D)
+    \tkzLabelPoints[below left,font=\sansmath\sffamily](D)
     \tkzLabelPoints[above left,font=\sansmath\sffamily](E)
     \tkzLabelPoints[above,font=\sansmath\sffamily](P)
     \tkzLabelPoints[below,font=\sansmath\sffamily](C)
@@ -46,8 +46,8 @@
     \tkzInterLL(O,P)(D,up)
     \tkzGetPoint{T}
 
-    \tkzLabelPoints[below right,font=\sansmath\sffamily](T)
-    \tkzLabelPoints[below right,font=\sansmath\sffamily](K)
+    \tkzLabelPoints[right,font=\sansmath\sffamily](T)
+    \tkzLabelPoints[above,font=\sansmath\sffamily](K)
     \draw (S) -- (P);
     \draw (C) -- (P);
     \draw (E) -- (K);