# If x= 3 cos θ- cos3θ, y= 3 sinθ-sin3θ then dy/dx=

1.  tan3 θ

2.  cot3 θ

3.  -tan3 θ

4.  -cot3 θ

4

-cot3 θ

Explanation :
No Explanation available for this question

# If x= et(cos t +sin t), y= et(cos t-sin t) then dy/dx=

1.  tan t

2.  –tan t

3.  tan (3t/2)

4.  –cot (3θ/2)

4

–tan t

Explanation :
No Explanation available for this question

# If x= 2 cos t- cos 2t, y= 2 sin t- sin 2t then dy/dx=

1.  tan t

2.  –tan t

3.  tan (3t/2)

4.  –cot (3θ/2)

4

tan (3t/2)

Explanation :
No Explanation available for this question

# If x= a(2 cos θ+cos 2θ), y= a(2 sin θ+sin 2θ)then dy/dx=

1.  tan t

2.  –tan t

3.  tan (3t/2)

4.  –cot (3θ/2)

4

–cot (3θ/2)

Explanation :
No Explanation available for this question

# If x= 3at/1+t3, y= 3at2/1+t3 then dy/dx=

1.  t(2+t3)/1-2t3

2.  t(2-t3)/1-2t3

3.  2bt/a(t2+1)

4.  2bt/a(t2-1)

4

t(2-t3)/1-2t3

Explanation :
No Explanation available for this question

# If x= 2at/ 1+t2, y= b(1-t2)/1+t2 then dy/dx=

1.  t(2+t3)/1-2t3

2.  t(2-t3)/1-2t3

3.  2bt/a(t2+1)

4.  2bt/a(t2-1)

4

2bt/a(t2-1)

Explanation :
No Explanation available for this question

# If x= a (cos t +t sin t), y= a(sin t- t cos t) then

1.  a

2.  at

3.  a2t2

4.  none

4

at

Explanation :
No Explanation available for this question

# If x= sin t cos 2t, y= cos t sin 2t then (dy/dx)t=π/4

1.  -2

2.  2

3.  -1/2

4.  1/2

4

1/2

Explanation :
No Explanation available for this question

# If x= a cos θ (1+cos θ), y=sin θ(1+cos θ) then (dy/dx)θ=π/2

1.  0

2.  1

3.  -1

4.  2

4

0

Explanation :
No Explanation available for this question

1.   –π/2

2.  2/π

3.  π/4

4.  4/π

4