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TRIGONOMETRIC IDENTITIES Prob 101

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Basic Trigonometric Identities :

$Text Box: Strategies for Proving Trig. Identities 1 Start with the most complex side. You may, however work on either side. 2 Change any tan x or cot x expression to sin x and cos x using the quotient identities. 3 Change any sec x or csc x expression to sin x and cos x using the reciprocal identities. 4 Simplify algebraically using expanding or factoring where appropriate 5 Use rules of fractions where needed – common denominators, multiplication and division rules for fractions. 6 If sin2x or cos2x etc. occurs, use the Pythagorean identities if they simplify the expression. This should be done if the number 1 occurs with the squared expression.$

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