What is your Zodiac sine?

Geometry Level 3

sin2(2)+sin2(4)+sin2(6)++sin2(88)+sin2(90)=? \sin^2 (2^\circ) + \sin^2 (4^\circ) + \sin^2 (6^\circ) + \cdots + \sin^2( 88^\circ) + \sin^2 (90^\circ)= \, ?

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