Math, asked by kurvasiddu0911, 1 month ago

if a=2 b=3 c=4 then find the cosA​

Answers

Answered by pallavinsharma124
1

Answer:

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

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Answered by geetalibora19
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}

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