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  • 1. (2017高二上·南京期末) 观察下列等式:

    (sin 2+(sin 2= ×1×2;

    (sin 2+(sin 2+(sin 2+sin( 2= ×2×3;

    (sin 2+(sin 2+(sin 2+…+sin( 2= ×3×4;

    (sin 2+(sin 2+(sin 2+…+sin( 2= ×4×5;

    照此规律,

    (sin 2+(sin 2+(sin 2+…+(sin 2=

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