S

Swapna

9 b

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A

Anju

Please see the answer

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A

Anju

xsin^3A+ycos^3A= sinAcosA

xsinA=ycosA

xsin^3A+xSinAcos^2A=sinAcosA

xsin^3A+xsinA(1- sin^2A)= sinAcosA

xsinA=sinAcosA

x=cosA

And y=sinA

x^2+ y^2 = 1

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