\(\cos^2 θ -\sin^2 θ = \cfrac{1}{2}\) হলে, \(\cos^4 θ – \sin^4 θ\) -এর মান __________


\(\cos^2 θ -\sin^2 θ = \cfrac{1}{2}\) হলে, \(\cos^4 θ – \sin^4 θ\) -এর মান \(\cfrac{1}{2}\)
\(cos^4⁡θ-sin^4⁡θ\)
\(=(cos^2⁡θ+sin^2⁡θ )(cos^2⁡θ-sin^2⁡θ )\)
\(=1×\cfrac{1}{2}\)
\(=\cfrac{1}{2}\)


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