81 ^o + 81 ^o 81 ^o - 81 ^o is equal to - Vidyadip

MCQ

$\frac{{\sin {{81}^o} + \cos {{81}^o}}}{{\sin {{81}^o} - \cos {{81}^o}}}$ is equal to

A
$cot9^o$
B
$tan9^o$
C
$cot54^o$
✓
$tan54^o$

✓

Answer

Correct option: D.

$tan54^o$

d
$E=\frac{1+tan\,9^o}{1-tan\,9^o} =tan\, 54^o$

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