# If α is a non real root number of x6 = 1 then  (α5 + α3 +α +1 ) / (α2 +1)

1.  α2

2.  0

3.  -α2

4.  α

4

-&#945;<sup>2</sup>

Explanation :
No Explanation available for this question

# If  cos θ - 4 sin θ = 1 then  sin θ + 4 cos θ   is equal to

1.  ±1

2.  0

3.  ±2

4.  ±4

4

&plusmn;4

Explanation :
No Explanation available for this question

# The extreme values of  4 cos(x2) cos(π/3  + x2 ) cos(π/3 - x2) over IR are

1.  -1, 1

2.  -2, 2

3.  -3, 3

4.  -4, 4

4

-1, 1

Explanation :
No Explanation available for this question

# If (tan 3A / tan A) =α then ( sin 3A/ sin A) =

1.  2a/a+1

2.  2a/a-1

3.  a/a+1

4.  a/a-1

4

2a/a-1

Explanation :
No Explanation available for this question

# If A+C =2B then(cos C - cos A) / (sin A -sin C) is equal to

1.  cot B

2.  cot 2B

3.  tan 2B

4.  tan B

4

tan B

Explanation :
No Explanation available for this question

# A+B= C⇒cos2A +cos2B + cos2C - 2 cos A cos B cos C

1.  1

2.  2

3.  0

4.  3

4

1

Explanation :
No Explanation available for this question

# If cos 2x = (√2 + 1)(cos x - 1/√2) , cos x ≠ 1/2 then x belongs to

1.  {2nπ ± π/6 : n Є Z }

2.  {2nπ ±π/3 : n Є Z }

3.  {2nπ ±π/2 : n Є Z }

4.  {2nπ ± π/4 : n Є Z }

4

{2n&#960; &plusmn; &#960;/4 : n &#1028; Z }<br>

Explanation :
No Explanation available for this question

# sin -1(4/5) + 2 tan -1(1/3)  is equal to

1.  0

2.  π/3

3.  π/4

4.  π/2

4

π/2

Explanation :
No Explanation available for this question

# 2 tan h -1 1/2  is equal to

1.  0

2.  log 2

3.  log 3

4.  log 4

4

log 3

Explanation :
No Explanation available for this question

1.  a

2.  b

3.  c

4.  a + b + c

4