Incorrect expression evaluation

[cesar-ioc]

I'm trying to evaluate the following expression:

sin x - (0.02449*x^3)-(1.67049*x)+(64.85606+(0.33683*x^2))+(sin (2*x))

Using this code:

String equation = "sin x - (0.02449*x^3)-(1.67049*x)+(64.85606+(0.33683*x^2))+(sin (2*x))";

Expression exp = new ExpressionBuilder(equation)
					.variables("x")
					.build()
					.setVariable("x", 1);

System.out.println(exp.evaluate()); // prints 0.5364612580927792

But according to WolframAlpha the correct result is 65.2487
Here is the direct link to WolframAlpha

I'm using version 0.4.8

[shuvamc019]

Using parentheses in the first sine function should give you the correct value.
"sin(x) - (0.02449x^3)-(1.67049x)+(64.85606+(0.33683x^2))+(sin (2x))"

The way that you have it written is slightly ambiguous and the parser is interpreting it as
"sin(x - (0.02449x^3)-(1.67049x)+(64.85606+(0.33683x^2))+(sin (2x)))"
where the entire expression is an argument of the sine function.

Using parentheses will clear up the confusion.