Let be the area of the region {\{(x,y)∈R^2:x^2+y^2≤21, y^2≤4x,x≥1}\}. Then \frac{1}{2}(Δ-21sin^{-1}⁡\frac{2}{\sqrt7}) is equal to: Area of Bounded Region (Mathematics) | DivineJEE