Question 11. Find , when and
Solution:
Here,
Differentiating it with respect to t using quotient rule,
and,
Differentiating it with respect to t using quotient rule,
Dividing equation (2) by (1)
Question 12. Find , when and
Solution:
Here,
Differentiating it with respect to t using chain rule,
Now,
Differentiating it with respect to t using chain rule,
Dividing equation (2) by (1)
Question 13. Find , when and
Solution:
Here,
Differentiating it with respect to t using quotient rule,
and,
Differentiating it with respect to t using quotient rule,
Question 14. If x = 2cosθ – cos2θ and y = 2sinθ – sin2θ, prove that
Solution:
Here,
x = 2cosθ – cos2θ
Differentiating it with respect to θ using chain rule,
and,
y = 2sinθ – sin2θ
Differentiating it with respect to θ using chain rule,
Dividing equation (2) by equation (1),
Question 15. If x = ecos2t and y = esin2t prove that,
Solution:
Here,
x = ecos2t
Differentiating it with respect to t using chain rule,
and,
y = esin2t
Differentiating it with respect to t using chain rule,
Dividing equation (2) by (1)
Question 16. If x = cos t and y = sin t, prove that
Solution:
Here,
x = cos t
Differentiating it with respect to t,
and,
y = sin t
Differentiating it with respect to t,
Dividing equation (2) by (1),
Question 17. If and , Prove that
Solution:
Here,
Differentiating it with respect to t,
and,
Differentiating it with respect to t,
Dividing equation (2) by (1)
Question 18. If and , -1 < 1 < 1, prove that
Solution:
Here,
Put t = tan θ
Differentiating it with respect to t,
Further,
Put t = tan θ
Differentiating it with respect to t,
Dividing equation (2) by (1),
Question 19. If x and y are connected parametrically by the equation, without eliminating the parameter, find , when: ,
Solution:
Here, the given equations are
and Thus,
Therefore,
Question 20. If and , find
Solution:
Here,
Differentiating it with respect to t using chain rule,
And,
Differentiating it with respect to t using chain rule,
Dividing equation (2) by (1)