Question

if a=2 b=3 c=4 then find the cosA​

Answer 1

Answer:

if a=2 b=3 c=4 then find the cosA

Answer 2

Answer:

$\cos(a) = \frac{7}{8}$

Step-by-step explanation:

$given \: \: a = 2 \: \: \: \: \: b = 3 \: \: \: \: c = 4$

$\cos(a) = \frac{ {b}^{2} + {c}^{2} - {a}^{2} }{2bc}$

$= \frac{9 + 16 - 4}{2 \times 12}$

$= \frac{21}{24}$

$\cos(a) = \frac{7}{8}$