I’m struggeling, with the result of this limit. Especially “cos(x)^3”. Can someone explain what does it mean? According to my professor it means “cos^3(x), she is basically saying that cos(x)^3 = cos^3(x). I don’t think that it’s correct assumption. Can someone explain conventions of using paranthesis in this case. Thank you so much!!

NOTE: I know the calculus, I know how to use powered cos, sin etc. and I know that cos^3(x) is different from cos(x^3).