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Q:

if $${secθ={a\over b},b≠0,then \ {{1-tan^2θ}\over 2-sin^2θ}  }=?$$

  • 1
    $${b^2(2b^2-a^2)}\over {a^2(a^2+b^2)}$$
  • 2
    $${a^2(2b^2-a^2)}\over {b^2(a^2+b^2)}$$
  • 3
    $${a^2(2b^2+a^2)}\over {b^2(a^2+b^2)}$$
  • 4
    $${a^2(2b^2+a^2)}\over {b^2(a^2-b^2)}$$
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Answer : 2. "$${a^2(2b^2-a^2)}\over {b^2(a^2+b^2)}$$"

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