cos10°sin40°-sin10°sin50°

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cos10°sin40°-sin10°sin50°cos10°sin40°-sin10°sin50°cos10°sin40°-sin10°sin50°cos10°sin40°-sin10°sin50°

cos10°sin40°-sin10°sin50°
cos10°sin40°-sin10°sin50°

cos10°sin40°-sin10°sin50°
cos10°sin40°-sin10°sin50°
=cos10°sin40°-sin10°cos40°
=sin(40-10)°
=sin30°
=1/2

cos10°sin40°-sin10°sin50°
=cos10°sin40°-sin10°cos40°
=sin(40-10)°
=sin30°
=1/2