TAN function
Description
Tangent function. TAN(x) returns the tangent of the angle x. The argument x must be expressed in radians. To convert degrees to radians you use the RADIANS function.
The tangent can be represented in terms of sine and cosine:
$$ \operatorname{tan}(x) = \frac{\operatorname{sin}(x)}{\operatorname{cos}(x)} $$
Example
TAN(PI()/4) equals 1.
TAN(0) equals 0.
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