In - ABC- if a - 3- b - 4- c - 5- then sin 2B -

Cos B = 9 + 25 16/2.3.5 = 18/2.3.5 = 3/5⇒ sin B = 4/5 Therefore sin 2B = 2.4/5. 3/5 = 24/25. ...

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Cosine Rule

In Δ ABC, if ...

Question

In $Δ A B C, i f a = 3, b = 4, c = 5, t h e n s i n 2 B =$

$\frac{4}{5}$

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$\frac{3}{20}$

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$\frac{24}{25}$

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$\frac{1}{50}$

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