Daqarta - Trigonometric Relationships

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	Trigonometric Relationships *sin(A) sin(B) = 1/2 * cos(A-B) - 1/2 * cos(A+B) cos(A) * cos(B) = 1/2 * cos(A-B) + 1/2 * cos(A+B) sin(A) * cos(B) = 1/2 * sin(A-B) + 1/2 * sin(A+B) sin^2(A) + cos^2(B) = 1 cos(0) = 1**
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