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22 January, 06:18

Sin^4 x - cos^4 what is x

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Answers (1)
  1. 22 January, 08:32
    0
    - cos 2x

    Explanation:

    sin

    4

    x

    -

    cos

    4

    x

    =

    (

    sin

    2

    x

    +

    cos

    2

    x

    )

    (

    sin

    2

    x

    -

    cos

    2

    x

    )

    Reminder:

    sin

    2

    x

    +

    cos

    2

    x

    =

    1

    , and

    cos

    2

    x

    -

    sin

    2

    x

    =

    cos

    2

    x

    Therefore:

    sin

    4

    x

    -

    cos

    4

    x

    =

    -

    cos

    2

    x
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