Integrating with Partial Fractions What is meant by partial fractions with quadratic denominators? For linear denominators the denominator of the original fraction can be factorised such that the d...
Mean Value of a Function What is the mean value of a function? The mean value of a function may be thought of as the ‘average’ value of a function over a given interval For a function f(x), the mea...
Improper Integrals What are improper integrals? An improper integral is a definite integral where one or both of the limits is either: Positive or minus infinity A point where the function is undef...
Adding and Subtracting Volumes Why might I need to add or subtract volumes of revolution? As with the area between a curve and a line or the area between 2 curves, a required volume may be created ...
Volumes of revolution around the x-axis What is a volume of revolution around the x-axis? A solid of revolution is formed when an area bounded by a function (and other boundary equations) is rotat...
Edexcel IGCSE Biology: Double Science 复习笔记 3.2.2 Genetic Inheritance Key Definitions A gene is a short length of DNA found on a chromosome that codes for a particular characteristic (exp...
Edexcel IGCSE Biology: Double Science 复习笔记 3.2.1 DNA & the Genome The Genome The entire set of the genetic material of an organism is known as its genome In 2003, scientists complete...
Edexcel IGCSE Biology: Double Science 复习笔记 3.1.7 Human Sex Hormones Secondary Sexual Characteristics Primary sexual characteristics are present during development in the uterus and are t...
Edexcel IGCSE Biology: Double Science 复习笔记 3.1.6 Pregnancy Implantation & Development of the Foetus After fertilisation in the oviduct, the zygote travels towards the uterus This usu...
