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Mamont248 [21]
3 years ago
8

Cos A+cosB+CosC=1+4sinA/2*sinB/2*sinC/2

Mathematics
1 answer:
Scrat [10]3 years ago
5 0
Socratic use det app
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The sides of a triangle are given as 3x, x - 1 and 3x + 1. If the perimeter [2]
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