sin119ºsin181º-cos1ºsin29º＝?

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sin119ºsin181º-cos1ºsin29º＝?
sin119ºsin181º-cos1ºsin29º＝?

sin119ºsin181º-cos1ºsin29º＝?
原式=sin61*(-sin1)-cos1*cos61=-cos(61-1)=-1/2