高考的那些事为您分享以下优质知识
高考数学中涉及到的公式非常广泛,涵盖了代数、几何、三角函数等多个领域。以下是一些常见的高考数学公式:
抛物线标准方程
$y^2 = 2px$
$y^2 = -2px$
$x^2 = 2py$
$x^2 = -2py$
直棱柱侧面积
$S = ch$
斜棱柱侧面积
$S = ch$
正棱锥侧面积
$S = frac{1}{2}ch$
正棱台侧面积
$S = frac{1}{2}(c + c)h = ch$
圆台侧面积
$S = frac{1}{2}(c + c)l = pi(R + r)l$
球的表面积
$S = 4pi r^2$
异面直线上两点距离公式
$d = sqrt{(AE + AF)^2 - (EF)^2}$
立几中长方体对角线长的公式
$d = sqrt{l^2 + w^2 + h^2}$
球的体积
$V = frac{4}{3}pi R^3$
排列恒等式
$A_n^m = frac{n!}{(n - m)!}$
$A_n^n = n!$
组合恒等式
$C_n^m = frac{n!}{m!(n - m)!}$
三角函数公式
$sin(a + b) = sinAcosB + cosAsinB$
$sin(a - b) = sinAcosB - sinBcosA$
$cos(a + b) = cosAcosB - sinAsinB$
$cos(a - b) = cosAcosB + sinAsinB$
$tan(a + b) = frac{tana + tanb}{1 - tanatanb}$
$tan(a - b) = frac{tana - tanb}{1 + tanatanb}$
$ctg(a + b) = frac{ctgactgb - 1}{ctgb + ctga}$
$ctg(a - b) = frac{ctgactgb + 1}{ctgb - ctga}$
$tan2A = frac{2tana}{1 - tan^2A}$
$ctg2A = frac{1 - tan^2A}{2ctga}$
$cos2a = cos^2a - sin^2a = 2cos^2a - 1 = 1 - 2sin^2a$
$sin^2frac{a}{2} = frac{1 - cosa}{2}$
$sin^2frac{a}{2} = -frac{1 - cosa}{2}$
$cos^2frac{a}{2} = frac{1 + cosa}{2}$
$cos^2frac{a}{2} = -frac{1 + cosa}{2}$
$tanfrac{a}{2} = sqrt{frac{1 - cosa}{1 + cosa}}$
$tanfrac{a}{2} = -sqrt{frac{1 - cosa}{1 + cosa}}$
$ctgfrac{a}{2} = sqrt{frac{1 + cosa}{1 - cosa}}$
$ctgfrac{a}{2} = -sqrt{frac{1 + cosa}{1 - cosa}}$
倍角公式
$sin2A = 2sinAcosA$
$cos2A = cos^2A - sin^2A$
$sin^2A = frac{1 - cos2A}{2}$
$cos^2A = frac{1 + cos2A}{2}$
半角公式
$sinfrac{a}{2}