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Trig (Rules (When to use rules? (Sine Rule: If you know two angles and a…
Trig
Rules
The Sine Rule
a/sinA = b/sinB = c/sinC
The Cosine Rule
a^2 = b^2 + c^2 - 2bc cosA
Area of any triangle
1/2absinC
When to use rules?
Sine Rule: If you know two angles and a side
Cosine Rule: if you know three sides or two sides and an angle
My memory techniques:
Sin:
ans+360n
(180-ans)+360n
Cos:
ans+360n
-ans+360n
Tan:
ans+180n
Identities:
tanX = sinX/cosX
sin^2X + cos^2X = 1