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Question

In ΔABC, if a=16,b=24 and c=20, then cosB2=

A
34
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B
14
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C
12
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D
13
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Solution

The correct option is A 34
formulaused
CosB2=s(sb)ac
s=a+b+c2
given
a=16,b=24,c=20
s=16+24+202=30
cosB2=s(sb)ac
=30(3024)20(16)
=(34)2
=34

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