11for the 1st 1 put
z1=-1
z2=0
z3=0
z4=0
saare answers correct aajaenge
Here are some good complex matrix question..........i have 2 more........
i have alrady solved them.......but plzzzz try them.....maybe u may have shorter approach
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UP 0 DOWN 0 0 6
6 Answers
112)
i) (A)
ii) (C)
iii) (B)
teell me whether i am correct or not as usual[3]
[34]
11
24aise nahin yaar..i am looking for some good method.........
haan par tere method se hi paper mein answer nikelega.....[1][1]
11waise IIT waaale aise ques kabhie nahin deenge
hum se woh 4 kadam aage hain !!!!!!!!!!!!!!
106Q2.
(i) z + z = 0
==> re(z) = 0
==> z is purely imaginary
So, A
(ii) z-z = 0
==> 2i Im(z) = 0
==> im (z) = 0
So, if z=x ... where x is real,
then re(z2) = x2 which is ≥0
and obviously Im(zn) = 0 for all n = IN
So, C
(iii) arg(z) = pi/8
==> z = rcospi/8 + irsinpi/8
z2 = r2(cospi/4 + i sinpi/4)
Re(z2) = r2*1/√2 which is > 0
similarly Re(z8) = r8*cos(pi) = -r8 which is ≤0
So, B
hence (i) A
(ii) C
(iii) B