In $△ A B C, a = 3, b = 4$ and $c = 5,$ then value of $s i n A + s i n 2 B + s i n 3 C$ is -

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Solution

$a = 3, b = 4, c = 5$
$a^{2} + b^{2} + c^{2} = 25$
$\Rightarrow$ Triangle is right angled at $∠ c$ .

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