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Question

In ΔABC,if a=3,b=4,c=5,then sin 2B=


A

45

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B

320

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C

2425

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D

150

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Solution

The correct option is C

2425


cosB=9+25162.3.5=182.3.5=35sin B=45Therefore sin2B=2.45.35=2425.


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