Step-by-step explanation:
1: change 'sin²A' and 'cos²B' into (1-cos²A)and (1-sin²A) respectively.
2:open the brackets and put signs accordingly.
3: cancel (-1) and (+1).
4: remaining is your answer.
You can verify this by plugging the numbers into the Pythagorean theorem,

, where c is the hypotenuse (the longest side, in this case 53).
So it would be:

The equation is true.
2809 = 2809
Answer:
it's hypotenuse
then
base^2+length ^2=hypotenuse^2
5^2+9^2=106^2
11236
if wrong correct me pls
have a great day ahead
CapTainGeNius
Not enough info. We dont have the prices from the stores