# If e and e1 are eccentricities of hyperbola xy = c2 and x2-y2=c2,then e2+e1

1.  1

2.  4

3.  6

4.  8

4

4

Explanation :
No Explanation available for this question

1.  00

2.  900

3.  450

4.  600

4

450

Explanation :
No Explanation available for this question

1.  4

2.  √2

3.  2√2

4.  1/√2

4

4

Explanation :
No Explanation available for this question

1.  0

2.  1

3.  0.5

4.  0.25

4

1

Explanation :
No Explanation available for this question

# The derivative of cos-1(2x2-1) w.r.to cos-1(x) is:

1.  2

2.  2/x

3.

4.

4

2

Explanation :
No Explanation available for this question

# siny = x sin (a+y),then dy/dx is:

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A particle is projected vertically upward.its height h at a time t has the relation h=60t-16t2.The velocity with  which it hits the ground is:

1.  30

2.  60

3.  90

4.  180

4

60

Explanation :
No Explanation available for this question

# Each side of an equilateral triangle expands at 2cm/sec.The rate of increase of the area when each side is 10,is

1.  10√2 sq units

2.  10√3 sq units

3.  10 sq units

4.  5 sq units

4

10&#8730;3 sq units

Explanation :
No Explanation available for this question

# The equation of the tangent to the curve y = be-x/a where it crosses the y-axis is:

1.  ax+by=1

2.  (x/a)+(y/b)=1

3.  (x/b)+(y/a)=1

4.  ax-by=1

4

(x/a)+(y/b)=1

Explanation :
No Explanation available for this question

# is equal to:

1.  1/2sin3x-1/5sin5x+c

2.  1/3cos3x-1/5sin3x+c

3.  1/3sin3x-1/5sin5x+c

4.  1/3tan3x-1/5sin5x+c

4