sec0-1/sec0+1=1-cos/1+cos0
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Sec0 - 1 / Sec0 + 1 = 1 - Cos0 / 1 + Cos 0
LHS = (1/Cos0 - cos0/cos0)/(1/Cos0 + cos0/cos0)
={(1-Cos0)(Cos0)} / {(1+cos0)(cos0)}
= 1-cos0/1+cos0 = RHS (because you crossed out the cos0)
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