C^2 = A^2 + B^2 -2AB cosC
Category: Tutoring News
Law of Sines
The Laws of Sines and Cosines. The Law of Sines establishes a relationship between the angles and the side lengths of ?ABC: a/sin(A) = b/sin(B) = c/sin(C).
Imaginary Numbers
An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i² = ?1. The square of an imaginary number bi is ?b². For …
Exapmle: Factoring a Polynomial
and you’d have to guess again. This guess-and-check method is looooooong and tedious, at best. In fact, this particular quadratic is prime, so you could guess and check all day long and it would never factor. If you’re in pre-calculus and your teacher …