# If cos 6θ+cos 4θ+cos 2θ+1=0 for 0≤θ≤π then θ=

1.  π/7,5π/7, π

2.  π/2, π/4, 3π/4, π/6, 5π/6

3.  π/8, 3π/8, 5π/8, 7π/8, π/3, 2π/3

4.  2nπ/3: n ε Z or nπ+ π/4: n ε Z

4

π/2, π/4, 3π/4, π/6, 5π/6

Explanation :
No Explanation available for this question

# The roots of the equation (b-c)x2+(c-a)x+(a-b)=0 are

1.  real

2.  real and equal

3.  real and not equal

4.  imaginary

4

real

Explanation :
No Explanation available for this question

# If sec x cos 5x+1=0, 0< x < 2π, then x=

1.  (n-1) π/3 or (2n-1) π/4

2.  (n+1) π/3 or (2n+1)π/4

3.  (2n-1) π/5 or (2n+1) π/4

4.  (2n+1) π/6 or (2n+1) π/4

4

(2n+1) π/6 or (2n+1) π/4

Explanation :
No Explanation available for this question

# If ad≠bc then the roots of (a2+b2)x2+2x(ac+bd)+(c2+d2)

1.  real

2.  real and equal

3.  real and not equal

4.  imaginary

4

imaginary

Explanation :
No Explanation available for this question

# If cos θ cos 2θ cos 3θ=1/4 for 0

1.  π/7,5π/7, π

2.  π/2, π/4, 3π/4, π/6, 5π/6

3.  π/8, 3π/8, 5π/8, 7π/8, π/3, 2π/3

4.  2nπ/3: n ε Z or nπ+ π/4: n ε Z

4

π/8, 3π/8, 5π/8, 7π/8, π/3, 2π/3

Explanation :
No Explanation available for this question

# For p,qR,the roots of (p2+q2)x2+2(p+q)x+2=0 are

1.  real and equal

2.  real and unequal

3.  equal complex numbers

4.  unequal complex numbers

4

unequal complex numbers

Explanation :
No Explanation available for this question

# The roots of the equation 2(a2+b2)x2+2(a+b)x+1=0 are

1.  real

2.  real and equal

3.  real and not equal

4.  imaginary

4

imaginary

Explanation :
No Explanation available for this question

# If

1.  1/4

2.  1/3

3.  1/2

4.  -1/3

4

-1/3

Explanation :
No Explanation available for this question

# If

1.  1/4

2.  π/2

3.  π/8

4.  3π/16

4

3π/16

Explanation :
No Explanation available for this question

# If l,m,n are rational,the roots of (m+n)x2-(l+m+n)x+l=0 are

1.  rational

2.  rational and equal

3.  rational and not equal

4.  irrational

4