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Function tan

Source 
pub fn tan(func: Function) -> Function
Expand description

Creates a Function equal to the tangent of the passed Function

i.e f(x) ⟹ tan(f(x))

Example:

    let x = Function::default();
    let tan_of_x = tan(x);
    assert_eq!(tan_of_x.call(PI / 4.), 1.);