How important are vector and tensor calculus in computer science?

Question

I have heard that computer science degree consists of calculus courses what is the importance of calculus in CS

Answer 1

I'd differ with this assessment. It would depend upon the type of department, I suspect. Many of the CS students at my college disliked math, and only took the minimum (calculus I & II, discrete math, and linear algebra). It is certainly possible to get much more into the theory and cross over with math to a great extent.

Vector calculus can be rather helpful for graphics, as it gets you more comfortable with 3D thinking.
Matrix operations are common for graphics (commonly taught as part of linear algebra), but that's a different beast from tensors

Tensor analysis I've only ever encountered in grad school, in the context classical mechanics and general relativity.