Trigonometric Identities
Pythagorean Identities.................................................................................................................................
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Sum/Difference Identities............................................................................................................................
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NOTE:
For identities involving p/2, use the above. For example: sin(x – p/2) = sin x cos p/2 – cos x sin p/2 = sin x · 0 – cos x · 1 = –cos x
Double Angle Identities................................................................................................................................
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Half Angle Identities (note: +
or – depends on the quadrant of x/2.)..............................................................
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Trigonometric Functions in Terms of Sine and Cosine...............................................................................
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Even/Odd Function Identities.......................................................................................................................
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Inverse Trigonometric Functions not on a Calculator in terms of those on a Calculator.........................
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Laws of Sines and Cosines...........................................................................................................................
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