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Let \Delta be the area of the region \(x,y)\in\mathbbR^2:\ x^2+y^2\le 21,\ y^2\le 4x,\ x\ge 1\. Then \dfrac12\Big(\Delta-21\sin^-1\!\dfrac2√7\Big) is equal to: | Watch the step-by-step video solution for this NIMCET PYQ.