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(1/tanx-secx))+(1/(tanx+secx))=-2tanx
13 years ago

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olivia
i've already attempted this question but something went wrong...
13 years ago
Steve
1/(tan-sec) + 1/(tan+sec)
= [(tan+sec)+(tan-sec)] / (tan^2 - sec^2)
= 2tan/(-1)
= -2tan
13 years ago

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