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The area enclosed by the curves x=asin^3...

The area enclosed by the curves `x=asin^3ta n dy="a c o s"^3t` is equal to (A)`12 a^2int_0^(pi/2)cos^4tsin^2tdt` (B) `12 a^2int_0^(pi/2)cos^2tsin^4tdt` (C) `2int_(-a)^a(a^(2/3)-x^(2/3))^(3/2)dx` (D) `4int_0^a(a^(2/3)-x^(2/3))^(3/2)dx`

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