Find the values of the following: \[ \sin ^{2} 30^{\circ}+\sin ^{2}...

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Find the values of the following:
\[
\sin ^{2} 30^{\circ}+\sin ^{2} 45^{\circ}+\sin ^{2} 60^{\circ}+\sin ^{2} 90^{\circ}
\]
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