For anyone that needs a little refresher course, the sine function gives the ratio of theoppositeside of a given Angle in a right triangle to the hypotenuse.
Theside of a right triangle oppositethe right angle .
纸的两个纸规边要成直角。
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The viewing Angle from the building is slightly inclined, giving an even more dramatic view of the strikingly beautiful mountains on the oppositeside of the narrow valley.