Question

Given A, B, C represents angles of a ⃤ AB and cosA + 2 cosB + cosC = 2 and AB = 3 and BC = 7 then cosA – cosC is?

• A. $-\frac{10}{7}$
• B. $\frac{10}{7}$
• C. $\frac{5}{7}$
• D. $-\frac{5}{7}$

Answer 1

Answer: (A)

$-\frac{10}{7}$

Answer 2

The correct answer is option (A) $-\frac{10}{7}$