SOLUTION: Simplify [(1/cosx) - tgx][(1/cosx) + tgx]

Question 949648: Simplify [(1/cosx) - tgx][(1/cosx) + tgx]
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

Simplify
......note that this is the "difference of squares"
=
= ...since , we have
=
= ...........since =>, so we have
=
=
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