明代末年是哪一年:函数式子化简
来源:百度文库 编辑:高考问答 时间:2024/04/28 18:40:51
1-(sin^6∝+cos^6∝)
原式=1-(sin^2∝+cos^2∝)(sin^4∝-sin^2∝*cos^2∝+cos^∝)
式子中这一步是怎样得来的???
(sin^4∝-sin^2∝*cos^2∝+cos^∝)
原式=1-(sin^2∝+cos^2∝)(sin^4∝-sin^2∝*cos^2∝+cos^∝)
式子中这一步是怎样得来的???
(sin^4∝-sin^2∝*cos^2∝+cos^∝)
立方和公式阿,x^3+y^3=(x+y)(x^2-xy+y^2)
没错!!!