Use identities to find the exact values at alpha for the rem
     Use identities to find the exact values at alpha for the remaining five trigonometric functions.  sec alpha = - 7 Squareroot/3 and alpha is in quadrant III cos alpha =  sin alpha =  csc alpha =  tan alpha =  cot alpha =   
  
  Solution
given seca = - 7sqrt3/3
cosa = 1/seca = - 3/(7sqt3)
sina = - sqrt138/(7sqrt3)
csca = 1/sina = - 7sqrt3/sqrt138
tana = sina/cosa = sqrt138/3
cota = 1/taana = 3/sqrt138

