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Q:

If cos θ = $${1\over \sqrt{10}}$$, then tan θ is equal to.

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

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