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по Samip Shrestha 4 лет назад

258

Fundamental Trigonometric Identities

Trigonometric identities are fundamental to the study of trigonometry and include several important relationships. Reciprocal identities express the reciprocal relationships between trigonometric functions, such as cotangent being the reciprocal of tangent and secant being the reciprocal of cosine.

Fundamental Trigonometric Identities

Fundamental Trigonometric Identities

Even Odd Identities

cot(-x) = -cot x
csc(-x) = -csc x
sec(-x) = sec x
tan(-x) = -tan x
cos(-x) = cos x
sin(-x) = -sin x

Pythagorean Identities

1 + cot^2 = csc^2
1 + tan^2 = sec^2
sin^2 + cos^2 = 1

Quotient Identities

cot = cos/sin
tan = sin/cos

Reciprocal Identities

cot = 1/tan
sec = 1/cos
csc = 1/sin
tan = 1/cot
cos = 1/sec
sin = 1/csc