A calculus based learning app. This app shows step by step differentiation of any expression. As an usage example there is one sample input available when app is launched . Input consists of two parts - Expressionvariable where Expression refers to the expression to be differentiated. For example sin(x)+tan(x-1)log(t*x) etc. And variable refers to the variable with respect to which the differentiation is to be carried out. Example xyt etc. E refers to exponential 'e'. Usage Examples: sin(x)+tan(x)x log(x+log(asin(x)))x 2x/3x E^sin(x)*atan(t)t asinh(E^x)x s1*x^3+3x acot(x+1)+acosec(x)x ..... etc