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Maths-

General

Easy

Question

$s i n space A plus s i n space 3 A plus s i n space 5 A plus s i n space 7 A equals$

$4 s i n A c o s 2 A c o s 4 A$
$4 s i n A c o s 2 A c o s 3 A$
$4 c o s A s i n 2 A s i n 4 A$
$4 c o s A c o s 2 A s i n 4 A$

The correct answer is: $4 c o s space A c o s space 2 A s i n space 4 A$

Apply SinC+SinD formula

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