# If 1-i is a root of the equation x2+ax+b=0, then b is equal to

1.  -2

2.  -1

3.  1

4.  2

4

2

Explanation :
No Explanation available for this question

# The general solution of tan2θ=3 is

1.  nπ+[(-1)n(π/3)]

2.

3.

4.  2nπ+[(-1)n(π/3)]

4

Explanation :
No Explanation available for this question

# If x n =cos(π/4 n )+i sin(π/4 n ), then x 1 x 2 x 3 ....... ͩ

1.  (1+i√3)/2

2.  (-1+i√3)/2

3.  (1-i√3)/2

4.  (-1-i√3)/2

4

(1+i&#8730;3)/2

Explanation :
No Explanation available for this question

# In a ∆ABC, r[cot(B/2)+cot(c/2)] is equal to

1.  R

2.  b

3.  c

4.  a

4

a

Explanation :
No Explanation available for this question

# If f(x)=sin2(π/8+π/2)-sin2(π/8-π/2), then the period of f is

1.  π

2.  π/2

3.  π/3

4.  2π

4

2&#960;

Explanation :
No Explanation available for this question

# In a ∆ABC, r1cot(A/2)+r2cot(B/2)+r3cot(C/2) is equal to

1.  2r

2.  3R

3.  4s

4.  3s

4

3s

Explanation :
No Explanation available for this question

# If cos(α+β)=4/5, sin (α-β)=5/13 and α, β between 0 and π/4, then tan 2α is equal to

1.  56/33

2.  33/56

3.  16/65

4.  60/61

4

56/33

Explanation :
No Explanation available for this question

# cos2760+cos2160-cos 760cos 160 is equal to

1.  1/2

2.  0

3.  -(1/4)

4.  3/4

4

3/4

Explanation :
No Explanation available for this question

# In a triangle A=√15-√11, B=√17-√13,then

1.  A<B

2.  A>B

3.  B=2A

4.  A=2B

4

A&gt;B

Explanation :
No Explanation available for this question

1.  π

2.  π/2

3.  π/3

4.  π/6

4