sec thetha + tan thetha = cos thetha / 1 sin thetha
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Sec theta = 1/Cos theta
Tan theta = Sin theta/Cos theta
Sec theta + Tan theta
= 1/cos theta + sin theta/cos theta
= 1 + sin theta/ cos theta
= (1 + sin theta)(1 - sin theta)/cos theta (1 - sin theta)
= 1 - sin² theta/cos theta (1 - sin theta)
= cos² theta/ cos theta (1 - sin theta)
= cos theta / 1 - sin theta
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