Trigonometry Examples Popular Problems Trigonometry Expand the Trigonometric Expression (xy)^3 (x y)3 ( x y) 3 Use the Binomial Theorem x3 3x2y3xy2 y3 x 3 3 x 2 y 3 x yThis is an identity, it will work for any values of x and y Explanation There are several methods for solving simultaneous equations, but in this case I like the idea that y = y 4xy=3 GeometricAddition and Difference Formula for Cosine Proof Let variables u and v be any real numbers Let A be the point (1, 0), and then use u and v to locate the points B(x 1, y 1), C(x 2, y 2), and D(x 3, y
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