secQ-tanQ/secQ+tanQ=1-2secQtanQ+2tan^2Q
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Step-by-step explanation:
secQ-tanQ/secQ+tanQ
=(secQ-tanQ)²/sec²Q-tan²Q
=(secQ-tanQl²
=sec²Q+tan²Q-2secQtanQ
=1+tan²Q+tan²Q-2secQtanQ
=1-2secQtanQ+2tan²Q
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