Define a function fsq that squares a number. Define the following dataframe

a$)$ Extract only those elements of row $2$ that are greater than $2.$

b$)$ Apply the function fsq on the third row of the function. Print the dataframe out to check if row three

is the only one that is squared.

c$)$ Print the dataframe with the fifth column excluded.

$4.$ Define a $3$x$3$ identity matrix and convert it into a dataframe.

in r