AM-995

Basic trigonometric identities

A Math · Secondary 3 · Hard · Basic trigonometric identities

Solve the equation

3\tan^2x+2\sec x-5=0

for

0^\circ\le x\le360^\circ

.

$41.4^\circ,120^\circ,240^\circ,318.6^\circ$
$41.4^\circ,138.6^\circ,221.4^\circ,318.6^\circ$
$60^\circ,120^\circ,240^\circ,300^\circ$
$41.4^\circ,221.4^\circ$

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