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Example 67
If x = a sec q , y = a tan
q , Find 
at q = 
Solution: x = a sec q
= a sec q tan q
and y = a tan q
= a sec2 q then,
= 
= 
= 
 =
=
=
=
Example 68
If x = a ( q - sin q
) and y = a ( 1 - cos q ). Show that
Solution : x = a ( q - sin q
)
= a ( 1 - cos q )
= 
and y = a (1 - cos q)
= a (sin q)
= 
=
= 
= 
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