Expanding a binomial squared with trig function

The video tutorial covers the concept of binomial squared, emphasizing the importance of using the distributive property correctly. It demonstrates this with both algebraic expressions and trigonometric functions, specifically focusing on the sine function. The tutorial highlights the correct notation for squaring functions, ensuring clarity in mathematical expressions. It concludes by simplifying expressions and reinforcing the learned concepts.

How do you differentiate between squaring the function and squaring the variable in trigonometric expressions?

What is the simplified form of sine of X plus sine of X?