Solve each of the following equations. $2 \cos^{2} x + 5 \sin x + 1 = 0$, $0 \le x \le 7$ \(\cos

Question

Solve each of the following equations. $2 \cos^{2} x + 5 \sin x + 1 = 0$, $0 \le x \le 7$ $\cos^{2} x - 4 \cos x = 3 \sin^{2} x$, $0^{\circ} \le x \le 360^{\circ}$

Accepted Answer

(i) $x = \dfrac{7\pi}{6}, \dfrac{11\pi}{6}$; (ii) $x = 120^\circ, 240^\circ$

Trigonometry - Trigonometric Equations

Trigonometry - Trigonometric Equations

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