Trigonometry+Matrix operations

The purpose of this app,is to assist students of natural sciences in these issues:
1.To determine the equation of an interpolation curve as a function of x,when given certain number of points.
2.Calculating the antiderivative and derivative of the equation of that curve.
3.Calculating the area under that curve.
4.Identifying intersection points of that curve on the x-axis.
5.Determining the maximum and minimum values of equation of that curve within a given interval.
6.Calculating matrix determinants.
7.Calculating adjoint matrices.
8.Calculating inverse matrices.
9.Solving system of linear equations.
10.Calculating matrix multiplication.
11.Calculating matrix addition.
12.Calculating matrix subtraction.
13.Calculating sin(x),cos(x),tg(x),ctg(x),sec(x),cosec(x),vs(x),cvs(x),exsec(x),excsc(x),chord(x),sin law,cos law,tg law,Pythagorian theorem,area of triangle,sum of angles inside triangle,surface area of circle,angle inscribed circle,intersecting chords,same segment angles,sin(a+b),cos(a+b),sin(a)*sin(b),sin(a)*cos(b),cos(a)*cos(b),sin(a-b),cos(a-b),etc....including the proof also.

-With this app,you can generate a polynomial equation up to the 14-th degree and solve a system of linear equations which can have 15 of them.
You can use numbers with up to 50 digits as input values and select up to 15 points for the interpolation curve.