trigonometry

Question: If$\cos 6\theta +\cos 4\theta +\cos 2\theta +1=0$, where $0<\theta <{{180}^{o}}$, then $\theta $ =

1) ${{30}^{o}},{{45}^{o}}$

2) ${{45}^{o}},{{90}^{o}}$

3) ${{135}^{o}},{{150}^{o}}$

4) ${{30}^{o}},{{45}^{o}},{{90}^{o}},{{135}^{o}},{{150}^{o}}$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

Rate this question:

★ ★ ★ ★ ★

Average rating: (0 votes)