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Conditional trigonometric identities
If A+B+ C =180°, prove that CosA + cosB+ cosC = 4CosA/2 CosB/2 SinC/2-1
If A+B+ C =180°, prove that CosA + cosB+ cosC = 4CosA/2 CosB/2 SinC/2-1
mskhanal
September 21, 2020
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Sadeep Khanal
21 September 2020 at 07:18
sir I am clear
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Unknown
21 September 2020 at 20:12
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If A+B+C =180°, prove that sinA/2 + sinB/2 + SinC/2=...
CosA SinB SinC + CosB SinC SinA + CosC SinA SinB = 1 + 4cosA cosB cosC
In the given figure, ∠AEF=∠AFE and E is the mid-point of CA. Prove that BD/CD = BF/CE
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sir I am clear
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