The trick is to type. Input LaTeX Tex AMSmath or ASCIIMath notation Click icon to switch to ASCIIMath mode to make formula. Just put your LaTeX math inside.
Again use to toggle the equation numbering.
Fortunately MathType has Tex translator. How to Typeset Equations in LATEX 8. The inline mode is used to write formulas that are part of the text and the display mode is used to write expressions that are not part of the text and hence are put on different lines. Functions ln log exp lg sin cos tan csc sec cot sinh cosh tanh coth arcsin arccos arctan arccsc arcsec arccot argsinh argcosh argtanh.