CHALLENGE
ACTIVITY
4.9.2: Change of coordinates matrices.
482086.2596304.qx3zqy7
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Let V be the vector space of functions spanned by
$n\pi$
B = \{b? = 6 sin x + 2 cos x, b? = 7 sin x + 3 cos x\} where x ? \frac{$n\pi$}{2}, n ? Z.
$n\pi$
C = \{c? = sin x, c? = cos x\} where x ? \frac{$n\pi$}{2}, n ? Z is also a basis for V. Find the change
of coordinates matrix P
$P$
C?B
Ex: 9
$P$
C?B
The coordinates of a function f(x) relative to the basis B are [f(x)]B = \begin{bmatrix} 4\\0 \end{bmatrix}. Find the
coordinates of f(x) relative to C and find f(x).
Ex: 9
[f(x)]c =
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f(x) = Ex: 9
sin x +
cos x
2
3
4
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