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If x((sin a)^3) + y((cos a)^3) = sin x and x(sin a) - y(cos a) = 0 then prove that x^2 + y^2 = 1.

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in Mathematics by (15 points)
edited by

I tried to do it but the answer is not as per the prove.
I got    x^2 + y^2 = 1/((cos a)^2). As answer pls check >_<

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