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Q:

The value of  $${cosec^2} 18° -{1\over cot^272°}$$.

  • 1
    $${1 \over \sqrt { 3}}$$
  • 2
    $$ \sqrt2\over {3 } $$
  • 3
    $${1\over2} $$
  • 4
    1
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Answer : 4. "1"

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