Q: $$ {Cos^4θ +Sin^4θ}={2 \over3} $$ then the value of $$ {Cos^2θ - – McqOptions

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1.	Q: $$ {Cos^4θ +Sin^4θ}={2 \over3} $$ then the value of $$ {Cos^2θ -Sin^2θ+1}$$?
A.	$$ {13 \over15} $$
B.	$$ {14\over15} $$
C.	$$ {15 \over14} $$
D.	$$ {15 \over13} $$
Answer» E.

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