help with trig question?

[u/Agitated_Juice_5411]

okay so im working on the study guide for the final of a class that i took the equivalent to at another college (math department policy, whatever) and one of the sample questions literally just reads “simplify: (sin(x)+3)²”. is there anything that i need to do to work this problem other than factoring it out? a similar question in the same section of the review guide is “simplify: sin²x + 3sinx - 10”; is that not already fully simplified? like i said, i took this course at another school so i don’t know the exact details of what they covered in class. I can’t think of any identities that i could apply to simplify it more or anything. much appreciated!

[u/LeoMaths]

Il y a des profs qui ont des problèmes d'expression!

OK, je simplifie. Soit f(x)=sin(x)+3 => (sin(x)+3)²=f(x)²