Answer :

Answer:

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SOLVE:

We have,

1

x

2

+

1

y

2

=

a

(

x

y

)

On putting

x

=

sin

α

and

y

=

sin

β

, we get

1

sin

2

α

+

1

sin

2

β

=

a

(

sin

α

sin

β

)

cos

α

+

cos

β

=

a

(

sin

α

sin

β

)

2

cos

'

α

+

β

2

.

cos

'

α

β

2

=

a

(

2

cos

'

α

+

β

2

.

sin

'

α

β

2

)

cos

'

α

β

2

=

a

sin

'

α

β

2

cot

(

α

β

)

2

=

a

α

β

2

=

cot

1

a

α

β

=

2

cot

1

a

sin

1

x

sin

1

y

=

2

cot

1

a

,

[

x

=

sin

α

and

y

=

sin

β

]

On differentiating both sides w.r.t.x, we get

1

1

x

2

1

1

y

2

d

y

d

x

=

0

d

y

d

x

=

1

y

2

1

x

2

=

1

y

2

1

x

2

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