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Is sec an inverse of sin?

Published in Trigonometry 1 min read

No, secant (sec) is not the inverse of sine (sin).

Secant (sec) is the reciprocal of cosine (cos). The reciprocal of a function is 1 divided by that function. Therefore, sec(x) = 1/cos(x).

The inverse of sine (sin) is arcsine (arcsin) or sin-1(x). The inverse function "undoes" the original function. Therefore, if sin(x) = y, then arcsin(y) = x. It's important to note that arcsin(x) is not the same as 1/sin(x), which is cosecant (csc).

Here's a table summarizing the relationships:

Function Reciprocal Inverse
Sine (sin) Cosecant (csc) = 1/sin(x) Arcsine (arcsin or sin-1)
Cosine (cos) Secant (sec) = 1/cos(x) Arccosine (arccos or cos-1)
Tangent (tan) Cotangent (cot) = 1/tan(x) Arctangent (arctan or tan-1)

In summary: Secant is the reciprocal of cosine, while arcsine is the inverse of sine. They are different concepts and functions.

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