Derivations of Trigonometric Formulae
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Flashcards1 - Prove Cos2 A + Sin2A = 1
2 - Prove a/SinA = b/SinB = c/SinC,
when given a general triangle
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Trigonometry
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8 Terms
1 - Prove Cos2 A + Sin2A = 1
2 - Prove a/SinA = b/SinB = c/SinC,
when given a general triangle
2 - Prove a/SinA = b/SinB = c/SinC
when given an obtuse-angled triangle
When SinA = SinB,
what do the angles add up to?
when Sin of an angle is equal to Sin of an angle, the angles add up to 180o
Sin108o = Sin72o
When CosA = SinB,
what do the angles add up to?
when Cos of an angle is equal to Sin of an angle, the angles add up to 90o
Cos60o = Sin30o
When CosA = - CosB,
what do the angles add up to?
when Cos of an angle is equal to negative Cos of an angle, the angles add up to 180o
Cos100o = - Cos80o
3 - Prove a2 = b2 + c2 -2bcCosA
4 - Prove Cos(A-B) = CosACosB + SinASinB
