Design and write a program to calculate the third angle and the other two sides of a triangle.

The input to the program is

the length of one side a (unit not important)

the sizes of the two angles adjacent to that side B, C degrees

An important point that your program must deal correctly with:

The C++ trigonometric functions for sine, cosine and tangent

all expect their arguments (parameters) to be angles measured in radians, not in degrees.