You can 
put this solution on YOUR website! .
1.    The formula is written  INCORRECTLY:  the name of the function  "tan"  before the first  "60 degrees"  is missed.
2.    If to use the formula  correctly written,  then the answer is:  
    the result is  UNDEFINED,  since the denominator of the fraction is equal to 0 (zero, ZERO).