The value of sin−1(1213)−sin−1(35) is equal to
π2−sin−1(5665)
π−cos−1(3365)
π2−cos−1(965)
π−sin−1(6365)
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sin−1(1213)−sin−1(35)
sin−1(x1−y2−y1−x2)
=sin−1(3365)=cos−1(5665)=π2−sin1(5665)