# In any ∆ ABC(a+b+c)(b+c-a)(c+a-b)(a+b-c)  / 4b2c2   =

1.  cos2 A

2.  cos2 B

3.  sin2 A

4.  sin2 B

4

sin<sup>2</sup> A

Explanation :
No Explanation available for this question

# P is a point on the segment joining the feet of two vertical poles of heights a and 6. The angles of elevation of the tops of the poles from P are 45o each. Then the square of the distance between the tops of the poles

1.  (a2 + b2) /2

2.  (a2 + b2)

3.  2(a2 + b2)

4.  4(a2 + b2)

4

2(a<sup>2</sup> + b<sup>2</sup>) <br>

Explanation :
No Explanation available for this question

# In a quadrilateral ABCD, the point P divides DC in the ratio 1 : 2 and Q is the mid point of AC.If

1.  -6

2.  -4

3.  6

4.  4

4

-6

Explanation :
No Explanation available for this question

# The angle between the lines whose direction cosines satisfy the equations l + m+ n =0, l2 + m2 – n2 = 0 is

1.  π/6

2.  π/4

3.  π/3

4.  π/2

4

π/3

Explanation :
No Explanation available for this question

1.  π/4

2.  π/3

3.  π/2

4.  3π/2

4

π/3

Explanation :
No Explanation available for this question

# If m1 , m2 , m3 and m4 are respectively the magnitudes of the vectors then the correct order of m1 , m2 , m3 and m4 is

1.  m3 <m1<m4<m2

2.  m3 < m1<m2<m4

3.  m3<m4<m1<m2

4.  m3<m4<m2<m1

4

m3 &lt;m1&lt;m4&lt;m2

Explanation :
No Explanation available for this question

# Suppose If the angle betweenis g

1.  -7 < Î» <1

2.  Î» > 1

3.  1 < Î» < 7

4.  -5 < Î» <1

4

-7 &lt; Î» &lt;1

Explanation :
No Explanation available for this question

# The volume of the tetrahedron having edges as coterminous , is 2/3 cubic units . Then λ =

1.  1

2.  2

3.  3

4.  4

4

1

Explanation :
No Explanation available for this question

# If A and B are events of a random experiment such that P(A ∪ B) = 4/5 . = 7/10 and P(B) = 2/6 then P(A) =

1.  9/10

2.  8/10

3.  7/10

4.  3/5

4

7/10

Explanation :
No Explanation available for this question

1.  1/9

2.  2/9

3.  3/9

4.  4/9

4