Description: first step : put the following code to join lt; Bodygt; Region lt; SCRIPT LANGUAGE = "java-script" gt; Lt; !-- Begin function doit () (form.input.value = eval (form.input.value)) Cos function () (x = form.input.value if (x ==) alert (Error : Input Required) = else form.input.value Math.cos (x)) function Sin () (x = form.input. value if (x ==) alert (Error : Input Required) = else form.input.value Math.sin (x)) function Ln () (x = form.input.value if (x ==) alert (Error : Input Required)
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