State True or False:
Cot(90 - A) = CotA is defined for a real value of A.

True

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False

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Solution

The correct option is B
False

In triangle ABC right angled at B,

$t a n A = \frac{B C}{A B} = c o t (90 - A)$

$c o t A = \frac{A B}{B C} = t a n (90 - A)$

$c o t (90 - A) = \frac{1}{C o t A} = t a n A$

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