Which function is undefined when x= pi/2 radians
cos x
cot x
csc x
tan x

Option 4 that is tan x will be undefined at x=pi/2 radians

Step-by-step explanation:

In case 1:

We have cos x

Therefore the function is defined hence, option 1 is discarded.

In case 2:

We have cot x and

Since,

And

Hence,

Hence, defined and Option 2 is discarded.

In case 3:

We have csc x and

Since,

Hence,

Hence, defined and Option 3 is discarded.

In case 4:

We have tan x and

Since,

And

Hence,

Hence, undefined and Option 4 is correct.

18

step-by-step explanation:

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solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b