(sec thita+1)(sec thita-1)
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Answer:
(sec∅+1)(sec∅-1)
=(1/cos∅+1)(1/cos∅-1)
=(1+cos∅/cos∅)(1-cos∅/cos∅)
=1²-cos²∅/cos²∅
= sin²∅/cos²∅
= tan²∅
hope it helps...!!!
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