Trigonometric Identities

reciprocal of sin x

1/csc x
reciprocal of cos x

1/sec x
reciprocal of tan x

1/cot x
reciprocal of csc x

1/sin x
reciprocal of sec x

1/cos x
reciprocal of cot x

1/tan x
pythagorean identities
- sin²x + cos²x = 1
- 1 + tan²x = sec²x
- 1 = cot²x = csc²x
quotient identity
- tan x = sin x/cos x
- cot x = cos x/sin x
sum-difference formulas
- sin (x +/- u) = sin x cos u +/- cos x sin u
- cos (x +/- u) = cos x cos u -/+ sin x sin u
- tan (x +/- u) = (tan x +/- tan u)/(1 -/+ tan x tan u)
double angle formulas
- sin(2x) = 2sin x cos x
- cos(2x) = cos²x - sin²x = 2cos²x - 1 = 1 - 2sin²x
- tan(2x) = (2tan x) /(1 - tan² x)

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Card Set

Trigonometric Identities

Description

list of trigonometric identities

Updated

2010-06-21T02:11:26Z

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