trig identity equations

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cos(A+B)=

CosA cosB - sinA sinB

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cos(A-B)

CosA cosB + sinA sinB

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sin(A+B)=

sinA cosB + cosA sinB

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Sin(A-B)=

sinA cosB - cosA sinB

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Tan(A+B)=

(tanA + tanB) / (1 - tanA tanB)

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Tan(A-B)=

(tanA - tanB) / (1 + tanA tanB)

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