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Math Help - Trigo qn

  1. #1
    Member maybeline9216's Avatar
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    Question Trigo qn

    Given that sin q= a+b and cos q = a- b,

    (a) find the value of a^2+ b^2
    Last edited by maybeline9216; October 8th 2008 at 03:38 AM. Reason: to delete something
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  2. #2
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    Quote Originally Posted by maybeline9216 View Post
    Given that sin q= a+b and cos q = a- b,

    (a) find the value of a^2+ b^2
    Is that really
    a^2 +b^2 ?

    Should it not be
    a^2 -b^2 ?
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  3. #3
    Member maybeline9216's Avatar
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    Quote Originally Posted by ticbol View Post
    Is that really
    a^2 +b^2 ?

    Should it not be
    a^2 -b^2 ?
    i really have no idea but that is wad the question paper wrote.....
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  4. #4
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    \sin ^2 (x) = a^2  + 2ab + b^2 \;\& \;\cos ^2 (x) = a^2  - 2ab + b^2
    1 = \sin ^2 (x) + \cos ^2 (x) = 2a^2  + 2b^2
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  5. #5
    Member maybeline9216's Avatar
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    Quote Originally Posted by Plato View Post
    \sin ^2 (x) = a^2 + 2ab + b^2 \;\& \;\cos ^2 (x) = a^2 - 2ab + b^2
    1 = \sin ^2 (x) + \cos ^2 (x) = 2a^2 + 2b^2
    Thanks a lot!!!
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