• ... can be seen in the figure. ... can be seen in Figure 2.1. (No 'the' when a particular figure is referred to.)
• Trigonometric functions are defined in Latex, please use them. $sin x$ is wrrong, $\sin x$ is correct.
• To write unit vectors in formulas use: $\hat{\imath}$ and $\hat{\jmath}$.
• For the multiplication sign, please use $\times$, do not write the letter x.
• Degree symbol is not superscript zero. Try $\degree$ from gensymb package. (Or at least $^{\circ}$.)
• Minus sign ($-$, −) is not a hyphen (-).