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Show that cos4x=1-sin²x.cos²x

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Show that cos4x=1-sin²x.cos²x

    • Posted by Infinite Voice 4 years, 7 months ago

    CBSE > Class 11 > Mathematics
    • 4 answers

    Manisha Dhibar 4 years, 7 months ago

    8 is missing

    0Thank You

    Manisha Dhibar 4 years, 7 months ago

    Yes

    0Thank You

    Sanchita Sharma 4 years, 7 months ago

    LHS : cos4x=cos2(2x) =1−2sin22x =1−2(sin2x)2 =1−2(2sinxcosx)2 =1−8sin2xcos2x  = RHS

    0Thank You

    Sanchita Sharma 4 years, 7 months ago

    cos4x=1-sin²x.cos²x here 8 is missing I thought

    1Thank You

    ANSWER
    http://mycbseguide.com/examin8/

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