Trigonometry - Trig Identities

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Algebra

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11 Terms

1
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related acute angle

angle from the terminal arm to the nearest x-axis and is 0 < x < 90 degrees

2
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co-related acute angle

terminal arm to the nearest y-axis

3
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sum and difference identities

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4
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how to prove an identity is false

plug in a value for theta → 1 in radians

5
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argument

x in sinx/cosx/tanx/etc

6
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after squaring both sides, you must:

check the solutions using LS and RS

7
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you can’t divide both sides of an equation w a variable when:

0 is a possible solution

8
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double angle formulas

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9
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start with the ______ double angle formula to find the exact value

cos2x

10
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the arm on the unit circle rotates in the __________________________

counter-clockwise direction

11
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