Hi there, basically I am learning differentiation and have the task of finding "the gradient of y = 3sin2t + 4cos2t, when t=2" using radians. I don't neccessarily need the answer to this, I would like to know the procedure used when tackling a question like this.

Thank you for reading, any help or links to video tutorials would be great. I just need to know how to get to the answer, thank you.