Question

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Answer 1

Answer:

1

Step-by-step explanation:

${ \cos }^{2} 60 + { \sin }^{2} 45 + { \sin }^{2} 30 + { \cos }^{2} 90 \\ = { \frac{1}{2} }^{2} + { \frac{1}{ \sqrt{2} } }^{2} + { \frac{1}{2} }^{2} + {0}^{2} \\ = \frac{1}{4} + \frac{1}{2} + \frac{1}{4} + 0 \\ = \frac{1 + 2 + 1}{4} \\ = \frac{4}{4} = 1$