if cos 0 = 2/3,find sec0-1/sec0+1
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put sec0 in form of cos0
then put value of cos0
answer =1/5
3/2-1/3/2+1
1/2/5/2
1/5
then put value of cos0
answer =1/5
3/2-1/3/2+1
1/2/5/2
1/5
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