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Question Number 183184 by Tawa11 last updated on 22/Dec/22

Commented by Tawa11 last updated on 22/Dec/22

$$\mathrm{Thanks}\mathrm{sir}.\mathrm{God}\mathrm{bless}\mathrm{you}.$$

Answered by mr W last updated on 22/Dec/22

$$x={\tan }^{-1}\left(\frac{\tan 10}{\tan 20\tan 40}\right)=30°$$

Commented by mr W last updated on 22/Dec/22

Commented by mr W last updated on 22/Dec/22

$$\tan x=\frac{BD}{BC}=\frac{a\tan 10°}{a\tan 20°\tan 40°}=\frac{\tan 10°}{\tan 20°\tan 40°}$$$$\Rightarrow x={\tan }^{-1}\left(\frac{\tan 10°}{\tan 20°\tan 40°}\right)=30°$$

Commented by Tawa11 last updated on 22/Dec/22

$$\mathrm{Wow},\mathrm{God}\mathrm{bless}\mathrm{you}\mathrm{sir}.$$

Commented by Tawa11 last updated on 22/Dec/22

$$\mathrm{I}{\mathrm{don}}^{\prime }\mathrm{t}\mathrm{know}\mathrm{how}.$$$$\mathrm{BC}=\mathrm{a}\tan 20\tan 40$$

Commented by manxsol last updated on 23/Dec/22

Commented by Tawa11 last updated on 23/Dec/22

$$\mathrm{Very}\mathrm{clear}\mathrm{now}.\mathrm{God}\mathrm{bless}\mathrm{you}\mathrm{sir}.$$

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