Use a calculator to approximate an angle measure for \( \cos ^{-1} 0.7439 \). Round to the nearest tenth of a degree. \[ 41.9^{\circ} \]

7. \( \sin ^{2} A+\sin ^{2} B-\sin ^{2} C=2 \sin A \sin B \cos C \)

Law of Sines Score: \( 11 / 25 \quad \) Penalty: 1 off Question In \( \Delta \mathrm{TUV}, u=3.4 \) inches, \( m \angle \mathrm{U}=144^{\circ} \) and \( m \angle \mathrm{~V}=35^{\circ} \). Find the length of \( v \), to the nearest 10 oth of an inch Answer Attempt 1 out of 2

22. Find the exact value of \( \sin (A+B) \), given \( \sin A=-\frac{4}{5}, A \) is in Quadrant \( I I I, \tan B=\frac{15}{17} \) and \( B \) is in Quadrant \( I \).

49. Hisoblang: \( 8 \cos \frac{\pi}{7} \cdot \cos \frac{4 \pi}{7} \cdot \cos \frac{5 \pi}{7} \) A) -1 B) 4 C) 1 D) 2

Solve, triangle \( A B C \) in which \( a=72.5, \angle B=60^{\circ}, \angle C=83^{\circ} \)