Does anyone know how resolve it?

1

Step-by-step explanation:

90°/n = 90°/∞ --> 0 , because when you divide number by huge number answer will become less and less, when you divide by ∞, answer will ---> 0.

cos(0°) = 1

1^(2n) = 1^(2∞)= 1^(∞) = 1, because 1 in any power = 1.

Because lim of constant is this constant.

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.