If r = (x, y), r1 = (x1, y1), and r2 = (x2, y2), describe the set of all points (x, y) such that |r – r1 | + |r – r2 | = k, where k |r1 – r2|. Example 48

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Learn all about the different trigonometric identities and how they can be used to evaluate, verify, simplify and solve trigonometric equations. The identities discussed in this playlist will involve the quotient, reciprocal, half angle, double angle, pythagorean, sum and difference. Identities help us rewrite trigonometric expressions #trigidentities #simplifytrigidentities