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If A and B ar square matrices of the sam...

If A and B ar square matrices of the same order and `AB=3I`, =then `A^(-1)` is equal to

A

3B

B

`(1)/(3)B`

C

`3B^(-1)`

D

`(1)/(3)B^(-1)`

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2009-MULTIPLE CHOICE QUESTIONS
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  5. General solutio of sin x+cos x=min(a in R) {1,a^(2)-4a+6} is

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  6. If A and B ar square matrices of the same order and AB=3I, =then A^(-...

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  8. For any two sets A and B, A-(A-B) equals

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  13. The value of (1+cospi//6)(1+cospi//3)(1+cos2pi//3)(1+cos7pi//6) is

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  14. If P=(1)/(2)sin^(2)theta+(1)/(3)cos^(2)theta then

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  15. int(dx)/(sinx+cosx) equals

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  16. If f(x)=f(a-x) then int(0)^(a)xf(x)dx is equal to

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  17. The value of int(0)^(prop)(dx)/((x^(2)+4)(x^(2)+9)) is

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  18. If I(1)int(0)^(pi//4)sin^(2)xdx and I(2)=int(0)^(pi//4)cos^(2)xdx, the...

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  19. The second order derivative of a sin’t with respect to a cos^(3)t at ...

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