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Terrible resource:
Cosine rule is quoted incorrectly
Second example is just an isosceles triangle which makes the Sine rule redundant
Some questions lead to forming a quadratic in x, only solvable by the quadratic formula...surely not what was intended.
from sbuksh, 10 May 2013
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1 out of 5
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Thanks - as person before said, made life easier than starting from scratch.
from numberwhizz, 07 February 2013
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4 out of 5
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very good resource the cos c bit is easily corrected beats starting from scratch any day
from reckdun, 18 November 2012
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5 out of 5
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'c² = a² + b² - 2abcosA' should be 'c² = a² + b² - 2abcosC'!
from Kevald, 25 September 2012
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3 out of 5
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The triangles are not right-angled because the whole point of the sine and cosine rule is to work out sides/angles of non-right-angled triangles.
from emanjii, 14 May 2012
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3 out of 5
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