Răspuns:
[tex]sin {}^{2} 45^{ \circ} = \Big( \frac{ \sqrt{2} }{2} \Big) ^{2} = \frac{2 {}^{(2} }{4} = \frac{1}{2} \\ [/tex]
[tex]cos {}^{2} 60^{\circ} = \Big( \frac{1}{2} \Big) ^{2} = \frac{1}{4} \\ [/tex]
[tex]sin {}^{2} 45^{\circ} - cos {}^{2} 60^{\circ} = \frac{ {}^{2)} 1}{2} - \frac{1}{4} = \frac{2 - 1}{4} = \boxed{\frac{1}{4} } \\ [/tex]
