MATH 152: Trig Identities
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11 Terms
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Sin and Cos Pythagorean Identity
sin²x + cos²x = 1
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Cot and Csc Pythagorean Identity
1 + cot²x = csc²x
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Tan and Sec Pythagorean Identity
tan²x + 1 = sec²x
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Sin Half-Angle Identity
sin²x = ½ (1 - cos2x)
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Cos Half-Angle Identity
cos²x = ½ ( 1 + cos2x)
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sinxcosx =
½ sin2x
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sin2x =
2sinxcosx
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cos2x =
cos²x - sin²x
2cos²x - 1
1 - 2sin²x
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Integral of tanxdx =
ln |secx| + C
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Integral of secxdx =
ln |secx + tanx| + C
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Integral of sec³xdx =
½ [ secxtanx + ln |secx + tanx| ] + C
Note 
Flashcards (20)