Find the angle x in terms of two inverse trigonometric funct
     Find the angle x in terms of two inverse trigonometric functions:  What is sec (pi/2 - x)? Express the answer as a simple fraction. 
  
  Solution
sinx=opposite/hypotenuse=7/25
x=arcsin(7/25)=16.26
adjacent=sqrt(625-49)=24
cos x=24/25
x=arccos(24/25)=16.26°
sec(pi/2-x)=cscx=1/sin x=25/7

