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Q:

यदि  $$ {Cos^4θ +Sin^4θ}={2 \over3} $$ तो का मान $$ {Cos^2θ -Sin^2θ+1}$$ क्या होगा?

  • 1
    $$ {13 \over15} $$
  • 2
    $$ {14\over15} $$
  • 3
    $$ {15 \over14} $$
  • 4
    $$ {15 \over13} $$
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Answer : 4. "$$ {15 \over13} $$"

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