Principle value of:

sec-1[cosec pie/8]

 Sec -1 (Cosec pi/8) = Sec -1 (Sec (pi/2 -pi/8) ) = Sec -1 (Sec3pi/8) = 3pi/8

  • 7

pie/8 means 180/8= 45/2 
as sec-1 (sec 45/2) = 45/2 ....... 

  • -4
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