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If $a+b+c=180^{\circ}$, prove that
$\sin^3 a+\sin^3 b+ \sin^3 c = 3\cos(\frac{a}{2})\cos(\frac{b}{2})\cos(\frac{c}{2})+ \cos(\frac{3a}{2})\cos(\frac{3b}{2})\cos(\frac{3c}{2})$
in Grade 12 Maths by Wooden (2k points) | 27 views

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us half angles, since the 3 angles add up to 180, expanding them will give the RHS expansion form
by Silver Status (28.5k points)

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asked Sep 21, 2019 in Grade 12 Maths by adminTedsf Wooden (2k points) | 39 views
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