It has the following functions: multiplicacion division sum subtraction Exponential function root function sine cosine tangent Note : If the characters of the buttons are out of the picture, reduce the size of text on the smartphone. syntax example: tan 45 * 9 + 5 : First meets the tangent of 45, then multiply the result by and finally adds 5. tan ( 45 * 9 ) + 5 : First, solve what is inside the parentheses, this result applies tangent and then adds 5. For more see attached photos shows.