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tan18-a-then-find-you-tan72-




Question Number 197035 by bbbbbbbb last updated on 06/Sep/23
tan18=a then find you tan72?
$$\mathrm{tan18}=\boldsymbol{\mathrm{a}}\:\boldsymbol{\mathrm{then}}\:\boldsymbol{\mathrm{find}}\:\boldsymbol{\mathrm{you}}\:\mathrm{tan72}? \\ $$
Answered by som(math1967) last updated on 06/Sep/23
tan72=cot(90−72)=cot18=(1/a)
$${tan}\mathrm{72}={cot}\left(\mathrm{90}−\mathrm{72}\right)={cot}\mathrm{18}=\frac{\mathrm{1}}{{a}} \\ $$

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