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OpenStudy (anonymous):
2 sec^2ß + tan^2ß-3=0
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Directrix (directrix):
Try using the identity 1 + tan²ß = sec² ß. 2 sec^2ß + tan^2ß-3=0 2* (1 + tan²ß ) + tan²ß - 3 = 0 Distribute the 2 and simplify. @ponoichi
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