cosd function not working

I have the student (covid) version Through CQU. when I am trying to use cosd(305) for example, I get a reply "Index exceeds the number of array elements (1)". sind and tand work fine.

How do I rectify this problem?

[James Tursa]

You have inadvertantly created a variable called cosd that is shadowing the function cosd( ). Clear the variable and pick a different name.

[Sean Kerlin]

Thankyou it is now fixed

Answer 1

[madhan ravi]

 clear cosd

[Sean Kerlin]

thankyou it is now fixed