Prove that:- $(c o s e c 30^{0} - 2) (c o t 20^{o} - 1) = 0$

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Solution

Considering L.H.S.

$(csc 30^{0} - 2) (cot 20^{0} - 1)$

$\Rightarrow (2 - 2) (cot 20^{0} - 1)$

$\Rightarrow 0 \times (cot 20^{0} - 1)$

$\Rightarrow 0$
R.H.S.

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