If \[x=a{{\cos }^{4}}\theta ,y=a{{\sin }^{4}}\theta ,\] then \[\frac{dy}{dx}\], at \[\theta =\frac{3\pi }{4}\], is [Kerala (Engg.) 2002]

If \[x=a{{\cos }^{4}}\theta ,y=a{{\sin }^{4}}\theta ,\] then \[\frac{d

1.	If \[x=a{{\cos }^{4}}\theta ,y=a{{\sin }^{4}}\theta ,\] then \[\frac{dy}{dx}\], at \[\theta =\frac{3\pi }{4}\], is [Kerala (Engg.) 2002]
A.	?1
B.	1
C.	\[-{{a}^{2}}\]
D.	\[{{a}^{2}}\]
Answer» B. 1

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If \[x=a{{\cos }^{4}}\theta ,y=a{{\sin }^{4}}\theta ,\] then \[\frac{dy}{dx}\], at \[\theta =\frac{3\pi }{4}\], is [Kerala (Engg.) 2002]

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