Xin Lin's answer to Libby's Secondary 3 A Maths Singapore question.
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BC^2
Date Posted:
4 years ago
Hi, can you explain your workings for (ii)? I don’t understand the first step
It’s under the formula for triangle (can be found in your amath formula sheet)
a^2 = b^2 + c^2 - 2bc(cos A)
Tks!
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