Matematika

Pertanyaan

sin⁴ x - cos⁴ x = 1- 2(sin x cos x)² - 2 cos⁴ x

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  • Identitas

    sin⁴ x - cos⁴ x = 1 - 2(sin x cos x)² - 2 cos⁴ x
    ruas kiri

    sin⁴ x - cos⁴ x =
    = (sin² x + cos² x)² - 2 (sin² x cos² x) -  2cos⁴  x
    = 1 - 2 (sin² x cos² x) -  2cos⁴ x
    kiri =kanan
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