sin6°cos24°sin78°cos48°的值是多少?
问题描述：
sin6°cos24°sin78°cos48°的值是多少?
答
sin6=0.1045284632676534713998341548025
cos24=0.91354545764260089550212757198532
sin78=0.9781476007338056379285667478696
cos48=0.66913060635885821382627333068678