TRIGONOMETRIC IDENTITIES
Trigonometric identities are equalities that involve trigonometric functions and are true for every single value of the occurring variables.
The Reciprocal Trigonometric Ratios
Sometimes it is useful to use the reciprocal ratios, depending on the problem.
Cosecant θ is the reciprocal of sine θ,
Secant θ is the reciprocal of cosine θ, and
Cotangent θ is the reciprocal of tangent θ
We usually write these as csc θ, sec θ and cot θ.
csc θ = HYPOTENUSE/OPPOSITE
sec θ= HYPOTENUSE/ADJACENT
cot θ= OPPOSITE/ADJACENT
Cosecant θ is the reciprocal of sine θ,
Secant θ is the reciprocal of cosine θ, and
Cotangent θ is the reciprocal of tangent θ
We usually write these as csc θ, sec θ and cot θ.
csc θ = HYPOTENUSE/OPPOSITE
sec θ= HYPOTENUSE/ADJACENT
cot θ= OPPOSITE/ADJACENT