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991

Q:

$$ {\sqrt{(cos^{2}20°+cos^{2}70°)}}$$ का मान ज्ञात कीजिये।

  • 1
    0
  • 2
    $$ {2\over{\sqrt{3}}}$$
  • 3
    1
  • 4
    $$ {\sqrt{3}\over2}$$
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Answer : 3. "1"

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