cos15-cos75
=cos(45-30)-cos(45+30)
=cos45*cos30+sin45*sin30-(cos45*cos30-sin45*sin30)
=2*sin45*sin30
=(sqrt2)/2
sqrt:是根號(hào).
cos15°-cos75°
cos15°-cos75°
各位前輩
幫忙寫出這道題目的運(yùn)算過(guò)程
謝謝拉!
各位前輩
幫忙寫出這道題目的運(yùn)算過(guò)程
謝謝拉!
數(shù)學(xué)人氣：900 ℃時(shí)間：2020-06-22 00:54:14
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