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    Hey guys,

    I've got my C3 exam in June and I have a question.

    What is cos^2(theta) equal to?

    Like is it (cos(cos theta) or something else. Thanks in advance.
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    (Original post by edsjay23)
    Hey guys,

    I've got my C3 exam in June and I have a question.

    What is cos^2(theta) equal to?

    Like is it (cos(cos theta) or something else. Thanks in advance.
    cos^2(x)=[cos(x)]^2=[cos(x)]*[cos(x)]=1-sin^2(x)
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    (Original post by reubenkinara)
    cos^2(x)=[cos(x)]^2=[cos(x)]*[cos(x)]=1-sin^2(x)
    Thank you so much for your reply, just wondering though is it for example;
    Cos^2(15) = cos(15)*cos(15)=(2+sqrt3)/4
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    (Original post by edsjay23)
    Thank you so much for your reply, just wondering though is it for example;
    Cos^2(15) = cos(15)*cos(15)=(2+sqrt3)/4
    Yes. Exactly.
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    (Original post by edsjay23)
    Thank you so much for your reply, just wondering though is it for example;
    Cos^2(15) = cos(15)*cos(15)=(2+sqrt3)/4
    yes
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    (Original post by reubenkinara)
    Yes. Exactly.
    you legend
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    (Original post by TenOfThem)
    yes
    ty xD
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    (Original post by TenOfThem)
    yes
    I guess it'd be easier if it was written like this (cos15)^2), but is this not the right format?
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    (Original post by edsjay23)
    I guess it'd be easier if it was written like this (cos15)^2), but is this not the right format?
    It is the same

    But not the usual format

    It would not be easier since \cos ^n \theta is clearly defined
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    (Original post by edsjay23)
    I guess it'd be easier if it was written like this (cos15)^2), but is this not the right format?
    You have one bracket like this ( and two like this )).

    We don't use that notation to avoid anyone thinking it might be cos (15^2) or cos (225). If you had used the right number of brackets you would have avoided such confusion.
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    You kinda needed to know that for core 2 as well you know, OP.
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    (Original post by TenOfThem)
    It is the same

    But not the usual format

    It would not be easier since \cos ^n \theta is clearly defined
    Oh right ty
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    (Original post by Mr M)
    You have one bracket like this ( and two like this )).

    We don't use that notation to avoid anyone thinking it might be cos (15^2) or cos (225). If you had used the right number of brackets you would have avoided such confusion.
    Oh right yeah makes sense. Thanks for your help. Are you a teacher?
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    (Original post by Pride)
    You kinda needed to know that for core 2 as well you know, OP.
    Never taught it in class. Good I know now though haha
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    (Original post by edsjay23)
    Oh right yeah makes sense. Thanks for your help. Are you a teacher?
    Yes.
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    (Original post by Mr M)
    Yes.
    wp. Are you a level, uni level or other?
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    (Original post by edsjay23)
    wp. Are you a level, uni level or other?
    GCSE and A Level.
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    (Original post by Mr M)
    GCSE and A Level.
 
 
 
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