what is the exact value of 7pi for all trig func.?
For trig functions, it is the same as the value for an angle of pi radians.
sin(7 pi) = sin pi = 0
cos(7 pi) = cos pi = -1
tan(7 pi) = tan pi = 0
sin(7 pi) = sin pi = 0
cos(7 pi) = cos pi = -1
tan(7 pi) = tan pi = 0