I am trying to enter a function and input multiple variables

[naryana.shankara]

I have 2 functions:
(cot(x))-1
(cos(2*(x)))/((1+(cot(x)))*(sin(x))^2)
and I need to enter the same values and compare the outputs.  This is a loss
of significance problem for a math class.
The values are
(pi/4),((5*pi)/4),((3*pi)/4) and ((7*pi)/4) 

my code is
clear all
A=(cot(x))-1
B=(cos(2*(x)))/((1+(cot(x)))*(sin(x))^2)
x=[(pi/4),((5*pi)/4),((3*pi)/4),((7*pi)/4)]
x*A
x*B

my output is
>>>error: `x' undefined near line 2 column 8
error: evaluating argument list element number 1
error: called from:
error:   /home/shankara/Documents/M365/HW2P2.m at line 2, column 2

I know I am doing something like comparing a function with a vector and
octave is grumbling.

What am I doing wrong and what should my code look like?

thanks




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