matematicas

    Cards (13)

    • el normal es perpendicular asi que tiene un negative reciprocal gradient
    • a quadratic equation has no solution if discriminant b^2-4ac<0
    • inequality sign changes when multiplying or dividing by a negative number
    • an equation is a function if each x value has only one y value (one-to-one, many-to-one)
    • angle of a sector in radians
      arc length/radius = angle
    • area of a sector in radians
      1/2 x r^2 x angle
    • double angle formula
      sin2x = 2sin(x)cos(x)
    • cos(2x) = cos^2x-sin^2x
      = 1-2sin^2x
      = 2cos^2x-1
    • tan(2x) = 2tanx/1-tan^2x
    • tan^2(x) + 1 = sec^2(x)
    • 1 + cot^2(x) = cosec^2(x)
    • cot(x) = cos(x)/sin(x)
    • sin (a +-b) = sinAcosB +- sinBcosA
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