Q$1)$ Write down a function that does the following: $1)$ checks if the input is a matrix, $2)$ if it is a matrix checks if it is square and $3)$ if it is square prints the sum of its diagonal elements. Hint: Use If statements and$/$or conditions on arguments. $(4$ points$)$

Use the Plot command to produce two SEPARATE graphs next to each other $($on $1$e same line$)$ for $sin(x)$ and $cos(x)$ between zero and $2,$ with red and green colors, espectively. Show ticks and the options for thickness, asrect ratio, axes title and frame. points$).$