(7/4) (21^2)

 

(7/4) (21^2) <tan (180/7)^-1 What is this answer?  

 

I am not really sure what your question is

 

(7/4) (21^2) tan^-1(180/7)

=(7/4)*(21^2)*atan (180/7) = 67738.7765028982455

 

 

or (the second one makes more sense.)

 

(7/4) (21^2) (tan (180/7))^-1

=(7/4)*(21^2)/(tan (180/7)) = 1602.5553878031321963