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PDF Simplifying Trig Expressions Worksheet A - The Math Class of Mrs. Loucks So for simplifying trig expressions we have to know about all the formulas of trigonometry .Some of the trigonometric formulas are as follows: sin = perpendicular / hypotenuse cos = Base / hypotenuse tan = perpendicular / Base . identities that it knows about to simplify your expression. 11. cos x (sec x - cos x) 12. cot x (tan x + cot x) 13. PDF Using Sum and Difference Formulas - Big Ideas Learning Trigonometry Examples | Simplifying Trigonometric Expressions o Sometimes, writing all functions in terms of sines and cosines may help. Scroll down the page for examples and solutions using the identities to simply trigonometric expressions. So let's say that I have 1 minus sine squared theta, and this . a. . 2 3 4 15 b. When in doubt . Trigonometric identities like sin+cos=1 can be used to rewrite expressions in a different, more convenient way. 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