Class ten, conditional trigonometric equations I

mskhanal September 12, 2020

Prove that

Cos2A + Cos2B + Cos 2C = -1 - 4CosA CosB CosC

Sin2A + Sin2B + Sin2c = 4 sinA sinB sin C

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5 Comments

Unknown12 September 2020 at 06:58
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Sadeep Khanal12 September 2020 at 18:36
Sir I understood all but why you didnt wrote -cosC over there in first page as formula.
sadeep
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Dikshya12 September 2020 at 20:05
1 pg
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salina pokharel12 September 2020 at 20:32
sir kunai ne bhujeana third step pachiiii ta
salina
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Ishpriha12 September 2020 at 22:42
Sir bujdai bujena yo ta
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