AM-901

Trigonometric ratios of any angle

A Math · Secondary 3 · Hard · Trigonometric ratios of any angle

Given that angle

A

is obtuse and

\cos A=-\dfrac{4}{13}

, find

\tan A

.

$-\dfrac{\sqrt{153}}{4}$
$\dfrac{\sqrt{153}}{4}$
$-\dfrac{4}{\sqrt{153}}$
$\dfrac{4}{\sqrt{153}}$

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