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यदि`A=[(1,sin theta, 1),(-sintheta, 1, sin theta),(-1,-sin theta,1)]` जहां `0lethetalepi` हो तो:A. `"det"(A)=0`B. `"det"(A)epsilon(2,oo)`C. `"det"(A)epsilon(2,4)`D. `"det"(A)epsilon[2,4]` |
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Answer» Correct Answer - D `:.A=[(1,sin theta, 1),(-sin theta, 1, sin theta),(-1,-sintheta, 1)]` `implies|A|=|(1,sin theta, 1),(-sin theta, 1, sin theta),(-1, -sin theta, 1)|` `=1(1+sin^(2)thetas)-sin theta(-sin theta+sin theta)` `+1(sin^(2)theta+1)=2+2sin^(2)theta` `0letheta2pi` के लिये `-1le sin theta le 1implies0le sin^(2)theta le 1` `implies1le1+sin^(2)thetale2` `implies2le 2+2sin^(2)theta le4implies2le |A|le4` `implies"det"A epsilon[2,4]` |
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