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if x=a cos^(4) theta, y= a sin^(4) theta...

if `x=a cos^(4) theta, y= a sin^(4) theta, "then" (dy)/(dx)"at" theta=(3pi)/(4)` is

A

`-1`

B

1

C

`-a^(2)`

D

`a^(2)`

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The correct Answer is:
A
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TARGET PUBLICATION-DIFFERENTIATION -HIGHER ORDER DERIVATIVES
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  13. If e^y\ (x+1)=1 , then (d^(2)y)/(dx^(2))= .

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  14. If y=ax^(5)+(b)/(x^(4))," then "(d^(2)y)/(dx^(2))=

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  15. If y=a x^(n+1)+b x^(-n),t h e n x^2(d^2y)/(dx^2) is equal to

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  17. If y=a^(x) b^(2x-1) ,then (d^(2)y)/(dx^(2))=

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  18. If y=log(x+sqrt(x^(2) +a^(2))), then (d^(2)y)/(dx^(2)), is equal to

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  19. If y=x^(2)+2x+3," then "(d^(2)x)/(dy^(2))

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  20. If y=x+e^x , then (d^2x)/(dy^2) is equal to

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