Sine, cosine and tangent are functions. You input a value - an angle in radians, or degrees, and for each angle there is a value. They are repeating functions.
They also have reciprocal functions.
The reciprocal of sine x is cosec x and is (1/sin x)
The reciprocal of cosine x is secant x and is (1/cos x)
The reciprocal of tan x is cotangent x (cot x) and is (1/tan x).
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