sin[arctan(1196/147)]
求(1196/147)的反正切,然后正弦
x = arctan( 1196/147 )
tanx = 1196/147
sinx = 1196/√( 1196^2 + 147^2 ) = 1196/1205
故 sin [ arctan( 1196/147 ) ] = sinx = 1196/1205 。
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求(1196/147)的反正切,然后正弦
x = arctan( 1196/147 )
tanx = 1196/147
sinx = 1196/√( 1196^2 + 147^2 ) = 1196/1205
故 sin [ arctan( 1196/147 ) ] = sinx = 1196/1205 。