2 tan 30/1-tan2 30 is equal to ?
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2tan 30 /(1-tan² 30)
=2tan 30/sec² 30. (1+tan²30=sec²30)
=2×1/root 3÷(2/root 3)²
=(2/root3)÷(4/3)
=root 3÷2
=sin 60 or cos 30
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