Show derivative obtained by taking derivative of bottom row

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Questions -

Q1. Let f(t), g(t) be two functions having derivatives of all orders. Let φ(t) be the function obtained by taking the determinant,

390_figure.png

Show that

782_figure1.png

i.e., the derivative is obtained by taking the derivative of the bottom row.

Q2. Let

2124_figure2.png

be a 2 x 2 matrix of differentiable functions. Let B(t) and C(t) be its column vectors. Let

φ(t) = Det (A(t))

show that

φ'(t) = D(B'(t), C(t)) + D(B(t), C'(t))

Textbook - LINEAR ALGEBRA, undergraduate texts in Mathematics, (3rd Edition) by Serge Lang.

Reference no: EM132443357

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