Matrix operations+trigonometry

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)
14.Calculating cos(x)
15.Calculating tg(x)
16.Calculating ctg(x)
17.Calculating sec(x)
18.Calculating cosec(x)
19.Calculating vs(x)
20.Calculating cvs(x)
21.Calculating exsec(x)
22.Calculating excsc(x)
23.Calculating chord(x)
24.Formulating sin law
25.Formulating cos law
26.Formulating tg law
27.Formulating Pythagorian theorem
28.Formulating area of triangle
28.Formulating sum of angles inside triangle
30.Formulating surface area of circle
31.Formulating angle inscribed circle
32.Formulating intersecting chords
33.Formulating same segment angles
34.Calculating sin(a+b)
35.Calculating cos(a+b)
36.Calculating sin(a)*sin(b)
37.Calculating sin(a)*cos(b)
38.Calculating cos(a)*cos(b)
39.Calculating sin(a-b)
40.Calculating cos(a-b),etc....
All above are ilustrared with the proof also.
-With this app,you can use numbers up to 50 digits while calculating the polynomial equation,which can be up to the 14-th degree and solve a system of linear equations containing 15 of them.