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16 February, 14:16

Verify the identity. cos 4u = cos^ (2) 2u - sin^ (2) 2u

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  1. 16 February, 14:30
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    cos (4u) = cos² (2u) - sin² (2u)

    cos (2u + 2u) = cos² (2u) - sin² (2u)

    cos (2u) cos (2u) - sin (2u) sin (2u) = cos² (2u) - sin² (2u)

    cos² (2u) - sin² (2u) = cos² (2u) - sin² (2u)
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