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24 December, 18:56

Verify sin4 x - sin2x = cos4x - cos2x is an identity

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  1. 24 December, 21:52
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    Step-by-step explanation:

    sin⁴ x - sin² x

    Factor:

    (sin² x) (sin² x - 1)

    Pythagorean identity:

    (1 - cos² x) (-cos² x)

    Distribute:

    -cos² x + cos⁴ x

    cos⁴ x - cos² x
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