Sum, double angle, and half angle trig formulas
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16 Terms
1
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cos(A+B)
cosAcosB - sinAsinB
2
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cos(A-B)
cosAcosB + sinAsinB
3
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sin(A+B)
sinAcosB + cosAsinB
4
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sin(A-B)
sinAcosB - cosAsinB
5
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tan(A+B)
\tan(a+b) = \frac{\tan a + \tan b}{1 - \tan a \tan b}
6
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tan(A-B)
\frac{tanA - tanB}{1 + tanAtanB}
7
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cos(2A) - cos and sin
cos²A-sin²A
8
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cos(2A) - only cos
2cos²A - 1
9
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cos(2A) - only sin
1 - 2sin²A
10
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sin(2A)
2sinAcosA
11
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tan(2a)
\frac{2\tan A}{1 - \tan^2 A}
12
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cos(0.5A)
\pm\sqrt{\frac{1 + \cos A}{2}}
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sin(0.5A)
\pm\sqrt{\frac{1 - \cos A}{2}}
14
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tan(0.5A) - just cos
pm\sqrt{\frac{1 - \cos A}{1 + \cos A}}
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tan(0.5A) - cos/sin
\tan\left(\frac{A}{2}\right) = \frac{1-\cos A}{\sin A}
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tan(0.5A) - sin/cos
\tan\left(\frac{A}{2}\right) = \frac{\sin A}{1+\cos A}
Note 
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