Mathematics, 01.04.2021 21:00 Bunnybear3384

If a + b + c = 0 then prove that cosa/2 + cosb/2 + cosc/2 = 4 cos (pi-a/4) cos (pi-b/4) sin (pi-c/4)

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If a + b + c = 0 then prove that cosa/2 + cosb/2 + cosc/2 = 4 cos (pi-a/4) cos (pi-b/4) sin (pi-c/4)...

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If a + b + c = 0 then prove that cosa/2 + cosb/2 + cosc/2 = 4 cos (pi-a/4) cos (pi-b/4) sin (pi-c/4) ​

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If a + b + c = 0 then prove that cosa/2 + cosb/2 + cosc/2 = 4 cos (pi-a/4) cos (pi-b/4) sin (pi-c/4)