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Question Number 139388 by mnjuly1970 last updated on 26/Apr/21

Answered by mr W last updated on 26/Apr/21

Commented by mr W last updated on 26/Apr/21

$$\frac{b/2}{y}=\cos \alpha$$$$\Rightarrow \frac{b^2}{y^2}=4{\cos }^2\alpha$$$$\frac{c/2}{x}=\sin \alpha$$$$\Rightarrow \frac{c^2}{x^2}=4{\sin }^2\alpha$$$$\frac{b^2}{y^2}+\frac{c^2}{x^2}=4({\cos }^2\alpha +{\sin }^2\alpha )=4$$

Commented by mnjuly1970 last updated on 27/Apr/21

$$thanksalotsir....$$

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