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Twalt13

  • 3 years ago

verify the identy cos4u=cos^2(2u)-sin^2(2u)

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  1. geerky42
    • 3 years ago
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    4u = 2(2u) Also, cos(a + b) = cos a cos b - sin a sin b so cos 2c = cos² c - sin² c

  2. Tushara
    • 3 years ago
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    this is one of the trig identities: cos^2x-sin^2x=cos2x can u solve it from dere?

  3. geerky42
    • 3 years ago
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    Can you do it from here? @Twalt13

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