Question

Law of cosines: a2 = b2 + c2 – 2bccos(A)

Answer 1

The correct answer is:

D. $y^{2}=9^{2}+19^{2}-2(9)(19)cos(41)$

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Answer 2

In this case,
a = y
b = 9
c = 19
So...
$a^2 = b^2 + c^2 - 2bc*\cos(A)$
$y^2 = 9^2 + 19^2 - 2*9*19*\cos(41^{\circ})$
which means the answer is choice D