AM-887

Trigonometric equations

A Math · Secondary 3 · Hard · Trigonometric equations

Solve the equation

2\tan^2\theta=5\sec\theta-1

for

0^\circ\le\theta\le360^\circ

.

$70.5^\circ,\ 289.5^\circ$ (to 1 d.p.)
$109.5^\circ,\ 250.5^\circ$ (to 1 d.p.)
$70.5^\circ,\ 250.5^\circ$ (to 1 d.p.)
$109.5^\circ,\ 289.5^\circ$ (to 1 d.p.)

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