draw method ：

straight line: (For example：3x − 2)

polynomial： (For example：x^3 + 3x^2 − 5x + 2)

trigonometric Function ： sin(x), cos(x/2), tan(2x), csc(3x), sec(x/4), cot(x)

opposite trigonometric Function ： arcsin(x), arccos(x), arctan(x), arccsc(x), arcsec(x), arccot(x)

Exponentiation(e^x)andlogarithm： ( Nature logarithms ：ln(x) base 10 logarithms：log(x)

The absolute value：:For example abs(x)

Hyperbolic Function and Antihyperbolic Function ： sinh(x), cosh(x), tanh(x), arcsinh(x), arccosh(x), arctanh(x)

Sign (1 if the sign is positive, −1 if the sign of the function is negative. For example, try sign(sin(x)))

You can also draw the math Function as follows ：

ceiling: ceil(x) and round: round(x)

square radical sqrt(x)

You can mix Use above Function like： "ln(abs(x))".

You have to use the rules for plotting, Example I "2 tan x" can be plotted, but "tan 2x" cannot be plotted. You must write like this： "tan(2x)".