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function fn.atan
import { fn } from "https://deno.land/x/denops_lsputil@v0.9.4/deps.ts";
const { atan } = fn;

Return the principal value of the arc tangent of {expr}, in the range [-pi/2, +pi/2] radians, as a Float. {expr} must evaluate to a Float or a Number. Returns 0.0 if {expr} is not a Float or a Number. Examples:

:echo atan(100)

    1.560797

:echo atan(-4.01)

    -1.326405

Can also be used as a method:

Compute()->atan()

Parameters

denops: Denops
expr: unknown

Returns

Promise<number>