The area of a triangle is half-a-b-sin-theta or half of the modulus of vector a cross vector b. Look out for differential equations, where dy/dt = dy/dx times dx/dt. Point of inflexion exists where d2y/dx2 = 0 and the sign changes from one side to the other; stationary point means dy/dx = 0 but not the other way around. Don't forget the modulus when converting complex numbers from cartesian form to cis form. r dot n equals p. A singular matrix means that the determinant is zero, and does not have an inverse matrix. Hypergeometric distribution is used for sampling without replacement; N = total number of objects, M = number of successes and n = number of trials. Standard deviation for a sample is the square root of the population variance divide by the size of the sample. Volume of revolution must be multiplied by pi, and f(x) is squared.
Happy Youth Day.
The Edna Man
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