Answer
See solution and image
Work Step by Step
$a=a$
$tan(a)=tan(a)$
$\frac{h_o}{d_o}=\frac{h_i}{d_i}$
$\frac{-d_i}{d_o}=\frac{h_i}{h_o}$
$m=\frac{h_i}{h_o}=-\frac{d_i}{d_o}$
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