Some useful references on Trigonometry:
Basic Identities:
Compound Angle Relations:
Product To Sum Formula:
Double Angle Formulae:
Factor Formulae:
Some Extra Things:
R-Formula:
a cos θ ± b sin θ = R cos (θ ∓ α)
a sin θ ± b cos θ = R sin (θ ± α)
,where
and,
and,and a > 0, b > 0, α is acute
Note:
The maximum value is R which occurs when cos/sin (θ ± α) = 1
The minimum value is -R which occurs when cos/sin (θ ± α) = -1
Even/Odd Functions
Cofunction Identities
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