$$ {Cos^4θ +Sin^4θ}={2 \over3} $$ then the value of $$ {Cos^2θ -Sin^2θ+1}$$?
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Q:
$$ {Cos^4θ +Sin^4θ}={2 \over3} $$ then the value of $$ {Cos^2θ -Sin^2θ+1}$$?
- 1$$ {13 \over15} $$false
- 2$$ {14\over15} $$false
- 3$$ {15 \over14} $$false
- 4$$ {15 \over13} $$true
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