In a ΔABC, cos[(B+2C+3A)/2]+cos[(A-B)/2] is equal to

1.  -1

2.  0

3.  1

4.  2

4

0

Explanation :
No Explanation available for this question

The value of the series cos 120 + cos 840 + cos 320 + cos 1560 is :

1.  1/2

2.  1/4

3.  -1/4

4.  -1/2

4

-1/2

Explanation :
No Explanation available for this question

For x є IR, 3cos(4x-5) + 4 lies in the interval :

1.  [1,7]

2.  [4,7]

3.  [0,7]

4.  [2,7]

4

[1,7]

Explanation :
No Explanation available for this question

If sin-1x+sin-1(1-x)=cos-1x, then x ε to

1.  {1,0}

2.  {-1,1}

3.  {0,1/2}

4.  {2,0}

4

{0,1/2}

Explanation :
No Explanation available for this question

If x=log[cot((π/4)+θ)], then the value of sinh x is

1.  tan2θ

2.  -tan2θ

3.  cot2θ

4.  - cot2θ

4

Explanation :
No Explanation available for this question

If, in aΔABC, r3=r1+r2+r , then ‹A+‹B is equal to

1.  1200

2.  1000

3.  900

4.  800

4

90<sup>0</sup>

Explanation :
No Explanation available for this question

In a ∆ ABC, (a-b)2cos2(C/2)+(a+b)2sin2(C/2) is equal to

1.  a2

2.  c2

3.  b2

4.  a2+b2

4

c<sup>2</sup>

Explanation :
No Explanation available for this question

In a ∆ ABC, the correct formulae among the following are: I. r=4Rsin(A/2)sin(B/2)sin(C/2)

1.  Only I,II

2.  Only II,III

3.  Only I,III

4.  I, II, III

4

Only I,III

Explanation :
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An aeroplane flying with uniform speed horizontally one kilometer above the ground is observed at an elevation of 600. After 10 seconds if the elevation is observed to be 300, then the speed of the plane (in

1.  240 / √3

2.  200√3

3.  240√3

4.  120 / √3

4

240&#8730;3

Explanation :
No Explanation available for this question

1.

2.

3.

4.

4