Algebra & Math Interpreter

The math interpreter is ready when the input prompt appears.  Expressions must be entered in usual mathematical infix- notation.  Faulty inputs will be rejected with error reports.  If an expression cannot be calculated, it will be returned unchanged.

Examples:
Differentiation:	DIFF(-1/5*x^2*TAN(LN(x)/2),x) DIFF(SIN(t^x),t)
Partial derivation:	DIFF(DIFF(1/(x^2 + y^2),x),y)
Integration:	INT(x^4*SIN(PI*x),x) INT(3*x^4+SIN(x),x,0,4)
Numeric calculation:	(8+123)*67-6 APPROX(SIN(23)*COS(3*0.7))
Evaluation of Polynomials:	SUBST(2x^2+x-3,x,4) (value of polynomial 2x^2+x-3 at x=4);
Taylor series:	TAYLOR(SINH(x^2),x,0,5)
Fourier analysis:	FOURIER(x,x,0,1,6)
Equation solving:	SOLVE(3*x^2-8=x-9+x^2,x)

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