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

(a) find the value of a^2+ b^2

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- Oct 8th 2008, 03:33 AMmaybeline9216Trigo qn
Given that sin q= a+b and cos q = a- b,

(a) find the value of a^2+ b^2

- Oct 8th 2008, 03:55 AMticbol
- Oct 8th 2008, 03:59 AMmaybeline9216
- Oct 8th 2008, 04:06 AMPlato
$\displaystyle \sin ^2 (x) = a^2 + 2ab + b^2 \;\& \;\cos ^2 (x) = a^2 - 2ab + b^2 $

$\displaystyle 1 = \sin ^2 (x) + \cos ^2 (x) = 2a^2 + 2b^2 $ - Oct 8th 2008, 04:13 AMmaybeline9216