CBSE Class 12 Math 2023 Outside Delhi Set 1 Solved Paper

SECTION - D

This section comprises Long Answer type questions (LA) of 5 marks each.

Question : 32 of 38

Marks: +1, -0

(a) If

A={[\table -3 , -2 , -4 ; 2 , 1 , 2 ; 2 , 1 , 3]}, B={[\table 1 , 2 , 0 ; -2 , -1 , -2 ; 0 , -1 , 1]}

, then find

A B

and use it to solve the following system of equations :

\;x-2 y=3

\;2 x-y-z=2

\;-2 y+z=3

OR
(b) If

f(α)={[\table \cos α , - sin \;α , 0 ; sin \;α , \cos α , 0 ; 0]}

, prove that

f(α) ⋅ f(-β)=f(α-β)

Solution:

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