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(If A+B+C=180) tan 2A + tan 2B + tan 2C = tan 2A tan 2B tan 2C​
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(If A+B+C=180)
tan 2A + tan 2B + tan 2C = tan 2A tan 2B tan 2C​

User Alexandre Leite
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Explanation:

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See explanation in picture.

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(If A+B+C=180) tan 2A + tan 2B + tan 2C = tan 2A tan 2B tan 2C​-example-1
User Madam Zu Zu
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