Trigonometric Double Angle Identities | ExamSolutions

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Here I show you how the trigonometric double angle identities are derived from the sum and difference identities.

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This video save my brakka brain 🧠
Thank you!!!

annahuang
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What about instead of tan 2A, we need to find tan A/2?

NellLiuNini
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I understand this but I just dont know how to use it on Double angle equations utilizing two different angle identities.

ULTIMARAGNARK
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sir if you have time may i ask why the sin2a = 2sinacosa but not 2sina2cosa? since there are also 2 cosine a's

miggy
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Very hard for me 💔 and we have end of term in March

Ha