If the sines of the angles B and C of ΔABC satisfy the equation a2x2-a(b+c)x+bc = 0,then the triangle is

1.  equilateral

2.  obtuse angled

3.  isosceles

4.  sinB+cosB=(b+c)/a

View Answer  
4
Correct Answer :

sinB+cosB=(b+c)/a


Explanation :
No Explanation available for this question

If sinβ is the G.M.between sinα and cosα then cos2β is equal to

1.  2sin2[(π/4)-α]

2.  2cos2[(π/4)-α]

3.  2cos2[(π/4)+α]

4.  2sin2[(π/4)+α]

View Answer  
4
Correct Answer :

2sin2[(π/4)-α]


Explanation :
No Explanation available for this question

If cos200=K and cosx = 2k2-1,then the possible values of x between 00 and 3600 are

1.  1400

2.  400 and 1400

3.  400 and 3200

4.  500 and 1300

View Answer  
4
Correct Answer :

400 and 3200


Explanation :
No Explanation available for this question

If α,β are solutions of a tanθ+bsecθ = c,then the [α+β]=

1.  2ac/(a2-c2)

2.  2ac/(c2-a2)

3.  2ac/(a2+c2)

4.  2ab/(a2+b2)

View Answer  
4
Correct Answer :

2ac/(a2-c2)


Explanation :
No Explanation available for this question

If sin-1a+sin-1b+sin-1c = π,then the value of will be

1.  2abc

2.  a2+b2+c2

3.  ab+bc+ca

4.  3abc

View Answer  
4
Correct Answer :

2abc


Explanation :
No Explanation available for this question

If 2b2=a2+c2,then the value of sin3B/sinB will be

1.  (a2-c2)2/2ac

2.  (a2+c2)2/2ac

3.  (a2+b2)/c2

4.  (a2-b2)4/2ab

View Answer  
4
Correct Answer :

(a2+c2)2/2ac


Explanation :
No Explanation available for this question

is

1.  i-8j+2k

2.  –i-8j+2k

3.  i-8j-2k

4.  i+8j+2k

View Answer  
4
Correct Answer :

i-8j+2k


Explanation :
No Explanation available for this question

are position vectors of A,B.The point P divides

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The vector magnitude 12√6 along the internal bisector of angle between the vectors 4i-7j+4k and i+2j-2k is

1.  

2.  

3.  4(7i-j-2k)

4.  4(7i-j+2k)

View Answer  
4
Correct Answer :

4(7i-j-2k)


Explanation :
No Explanation available for this question

The position vectors of points A,B,C,D are(0,2,1),(-5,3,2),(2,4,1)respectively ifthen the position vector of P is….

1.  (0,0,5)

2.  (0,10,5)

3.  (0,10/3,5/3)

4.  (0,5/2,5/4)

View Answer  
4
Correct Answer :

(0,5/2,5/4)


Explanation :
No Explanation available for this question
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