sin37°cos83°+cos37°sin83°

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sin37°cos83°+cos37°sin83°sin37°cos83°+cos37°sin83°sin37°cos83°+cos37°sin83°解sin37°cos83°+cos37°sin83

sin37°cos83°+cos37°sin83°
sin37°cos83°+cos37°sin83°

sin37°cos83°+cos37°sin83°
解sin37°cos83°+cos37°sin83°=sin(37°+83°)=sin120°=sin60°=1/2