trigonometry

Question: If $\cos {{40}^{o}}=x$ and $\cos \theta =1-2{{x}^{2}}$, then the possible values of $\theta $lying between ${{0}^{o}}$and ${{360}^{o}}$is

1) ${{100}^{o}}$and ${{260}^{o}}$

2) ${{80}^{o}}$and${{280}^{o}}$

3) ${{280}^{o}}$and ${{110}^{o}}$

4) ${{110}^{o}}$and ${{260}^{o}}$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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