Trigonometry identities

easy to learn in a table, includes double angle formulae, reciprocal trig functions etc :)

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Reciprocal trig functions
Original function Equivalent function
Sin2 + cos 2=1 1+cot2 = cosec 2
Sin2 + cos 2=1 Tan2 +1 =sec 2
Cosec 1/sin
Sec 1/cos
cot 1/tan OR cos/sin
Coumpound angle
formulae
Sin(±) * Sincos ± sincos
Cos(±) * Coscos - sinsin
Tan(+) Tan + tan/1- tantan
Tan(-) Tan - tan/1+ tantan
Double angle formulae
Sin2 2sincos
Cos2 Cos2 ­ sin2
Cos2=1-sin2 =>
cos2=1-2sin2
Sin2=1-cos2 =>
cos2=2cos2-1
asin± bcos=c Rsin(±)=R(sincos ±
cossin)
acos±bsin=c Rcos(-)=R(coscos±sin
sin)
Small angle approximations
sin

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When angle is very small…read more

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