zed963
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I'm just wondering, are we supposed to know the proofs for the edexcel c2 exam?
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TenOfThem
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(Original post by zed963)
I'm just wondering, are we supposed to know the proofs for the edexcel c2 exam?
Perhaps you could clarify what proofs you are asking about
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zed963
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(Original post by TenOfThem)
Perhaps you could clarify what proofs you are asking about
sine rule and cosine rule
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ollz272
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(Original post by zed963)
sine rule and cosine rule
https://www.khanacademy.org/math/tri...--law-of-sines

https://www.khanacademy.org/math/tri...law-of-cosines

old videos but v good
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TenOfThem
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(Original post by zed963)
sine rule and cosine rule
No
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interstitial
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(Original post by zed963)
sine rule and cosine rule
Not required at all, but I prefer to learn them to understand what is going on.

Just drop a perpendicular line from the top and they shouldn't be too difficult to derive on the spot (well, sine rule anyway. Cosine is a bit more complex.)

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