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multivariable calculus - What does italic i mean in integral calculator? - Mathematics Stack Exchange
![Could someone help me solve this? I tried an integral calculator online but it gave me a solution with something called sec. I don't know what sec is, I haven't learned about Could someone help me solve this? I tried an integral calculator online but it gave me a solution with something called sec. I don't know what sec is, I haven't learned about](https://preview.redd.it/could-someone-help-me-solve-this-i-tried-an-integral-v0-xspizs23kp3a1.png?auto=webp&s=0e9ccf364a2fe7c422a43e9df3c56e3d0b639d58)
Could someone help me solve this? I tried an integral calculator online but it gave me a solution with something called sec. I don't know what sec is, I haven't learned about
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