1) Write a code which enables a user to input the coefficients of the equation q(x)=ax4+bx3+cx2+dx and plot the function q(x) for x = cos y where y [-, ].

2) Using the command find, plot the function f(x) = (2x+1) / cos x for x[3,3]. You will need to change the code to determine when the denominator becomes small, rather than when it is identically zero.

using matlab