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Q:

$$ {Cos^4θ +Sin^4θ}={2 \over3} $$ then the value of $$ {Cos^2θ -Sin^2θ+1}$$?

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

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