If a=13 , b =12 , c =5 , then cos( A /2) =
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Answered by
0
Step-by-step explanation:
ok but i can't understand
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Answered by
0
Answer:
We have,
a=13
b=12
c=5
Then, we know that
cosA=
2bc
b
2
+c
2
−a
2
cosA=
2×12×5
12
2
+5
2
−13
2
cosA=
120
144+25−169
cosA=
120
169−169
cosA=
120
0
cosA=0
cosA=cos
2
π
A=
2
π
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