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Question Number 83513 by jagoll last updated on 03/Mar/20

$$\mathrm{If}\mathrm{m}\tan (\theta -{30}^{\mathrm{o}})=\mathrm{n}\tan (\theta +{12}^{\mathrm{o}})$$$$\mathrm{prove}\mathrm{that}\cos 2\theta =\frac{\mathrm{m}+\mathrm{n}}{2(\mathrm{m}-\mathrm{n})}$$

Commented by mind is power last updated on 04/Mar/20

$$false\theta =-12\Rightarrow m=0$$$$\Rightarrow cos(-24)=-\frac{1}{2}false$$$$$$

Commented by jagoll last updated on 04/Mar/20

$$\mathrm{oo}\mathrm{this}\mathrm{question}\mathrm{wrong}.\mathrm{thank}\mathrm{you}$$$$\mathrm{sir}$$

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