How to use SEC function in Excel?

The SEC function in Excel calculates the secant of a given angle. The secant of an angle is defined as the reciprocal of the cosine of that angle.

Here’s how to use the SEC function:

SEC(number)

number: This is the angle in radians for which you want to calculate the secant.

   =SEC(A1)

Enter the Angle: Make sure your angle value is in radians. If you have it in degrees, you will need to convert it using the `RADIANS` function. For example, `RADIANS(60)` converts 60 degrees to radians.
Use the SEC Function: In a cell, type the function like this:

Here, `A1` contains the angle in radians. Alternatively, you can directly input the angle in radians like this:

   =SEC(1.0472)

(This is approximately 60 degrees in radians).

Suppose you have an angle of 60 degrees that you want to find the secant for:

   =RADIANS(60)

Let’s say this returns `1.0472`.

   =SEC(1.0472)

Or, combining the steps:

   =SEC(RADIANS(60))

The angle input to the `SEC` function must be in radians.
If you need to work with degrees, convert using the `RADIANS` function.
Be cautious with angles for which the cosine value might be zero or extremely small since the secant function involves a division by cosine, which could lead to large values or errors.

By using the SEC function, you can perform trigonometric calculations directly in Excel, streamlining mathematical analysis within spreadsheets.

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